Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc1d3daac5ca52d…

MALICIOUS

PDF

90.3 KB Created: 2021-03-18 18:14:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 77085f42148ab755c063230590031efe SHA-1: 53370a403f60a3576209ef3bc82c2d1b255ee21e SHA-256: fbc1d3daac5ca52dfec8906741cb8714d9ba7373b762df3a0ae9816b247b4e66
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malware or phish users. The primary malicious URL identified is dugedepap.ru, which is presented as a download for 'Uc for pc 32 bit'. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dugedepap.ru/123?utm_term=uc+for+pc+32+bit PDF link annotation
    • https://sidutoxa.weebly.com/uploads/1/3/4/8/134886075/302f6b6b14c9.pdfIn PDF document text
    • https://mezamavizasiv.weebly.com/uploads/1/3/5/3/135312133/5228871.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403266/normal_5fe2686b707f6.pdfIn PDF document text
    • https://soguleta.weebly.com/uploads/1/3/4/3/134305846/jodonedo_japaparumaduti_gubinekelu_nagem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388067/normal_5ff1131d3c624.pdfIn PDF document text
    • https://vujebitaj.weebly.com/uploads/1/3/4/7/134759162/8167842.pdfIn PDF document text
    • https://mudagetani.weebly.com/uploads/1/3/4/3/134381332/9277915.pdfIn PDF document text
    • https://digikugububim.weebly.com/uploads/1/3/0/7/130774990/zibolakuxit_welax_kigowoxolapef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369508/normal_604f52ae4528e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376382/normal_604d35bea0cdc.pdfIn PDF document text
    • https://ravixibede.weebly.com/uploads/1/3/4/5/134584659/7113186.pdfIn PDF document text
    • https://fojexoduzasob.weebly.com/uploads/1/3/4/6/134693365/5069619.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448743/normal_60163ecaddc67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461786/normal_5febdd41bd4ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529780/normal_5fc6a424b82b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388596/normal_6022a6aeb3426.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416939/normal_5ff1f4189a44c.pdfIn PDF document text
    • https://nugekepujipa.weebly.com/uploads/1/3/4/3/134318644/90bd05d41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450430/normal_602985521576a.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dudurat/preposition_exercises_for_grade_5_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/66652411045.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/pokemon_book_for_cards_uk_booster_box.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/26762003078.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f4c74da-91e1-475f-852a-6954d63389db/36854008704.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c330500-edbe-41df-9725-170ff674f307/baronobameluregi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a15ff891-c338-421d-94b3-faf13081ba62/katolaxinefabutegape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b187ed2-27e3-4597-ab06-f9dd8d4bed80/23934444955.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e3aee02-7326-424a-b8d3-cc3df58c3a00/what_type_of_government_did_the_soviet_union_have_during_ww2.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000fbf3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFBF3 16388 bytes
SHA-256: a95b2a442ffa0f1784144bfc62d570dbf3aac6bfbee1fb9d3fa721c532dd46a0
font_00_sfnt_off0000ec5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5B 4580 bytes
SHA-256: dab4ac291a5e629af85f01c56eb8f37b02e94e97dd65d428abb5c46ec854cb28
font_02_sfnt_off0001298c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298C 10244 bytes
SHA-256: a033af9c2773f21c1a9e7cd1da6c8f572aa2e14dee62394485b9d4a774079fbb
font_03_sfnt_off00014cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CBC 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2