Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c80ce2316b2d42…

MALICIOUS

PDF

83.9 KB Created: 2021-06-11 03:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cebb761f1a46527c8a36c79ff447c69f SHA-1: 1a097cfa37e67cc75f807d2bb63c0e2644e49987 SHA-256: 79c80ce2316b2d4216d8f77a297ecc77447d550cd4543201c6dadca41e42c233
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://inwebjor.ru/pbw?utm_term=action+movies+download+mp4 PDF link annotation
    • https://sexaximelukifa.weebly.com/uploads/1/3/1/0/131069869/meropapoxi-xisatidunesiraw-begotunolijewal-bilixikajuxa.pdfIn PDF document text
    • https://buvujufa.weebly.com/uploads/1/3/1/3/131379824/pirunodedafamesuges.pdfIn PDF document text
    • https://givosusomab.weebly.com/uploads/1/3/5/3/135349573/tazukujosu_tuzagefinozimu_rarez_rupakepigu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379474/normal_5fe1ed877b6ab.pdfIn PDF document text
    • https://zademufexek.weebly.com/uploads/1/3/4/7/134765537/bigebuwobar.pdfIn PDF document text
    • https://bativazuwa.weebly.com/uploads/1/3/0/9/130969541/3637f76e917d6a4.pdfIn PDF document text
    • https://papilezuserif.weebly.com/uploads/1/3/4/4/134437149/6907745.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501656/normal_5fde93ed7c24d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465145/normal_605324bb549c9.pdfIn PDF document text
    • https://wuxotiwor.weebly.com/uploads/1/3/4/3/134335057/pewixumavesugifip.pdfIn PDF document text
    • https://retuxuzuj.weebly.com/uploads/1/3/4/6/134688644/8b872435434af2.pdfIn PDF document text
    • https://domuzowejiro.weebly.com/uploads/1/3/4/3/134360268/vulebeseg-nekojiga-niniwozigiwodo-nasigur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406497/normal_5fee2a1f3c59f.pdfIn PDF document text
    • https://bifukedupojuxi.weebly.com/uploads/1/3/4/4/134498794/bunawo-wakovuxuvibimuz-takedes-pufin.pdfIn PDF document text
    • https://donedupefunesu.weebly.com/uploads/1/3/1/6/131607777/pelinosorimusabud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458394/normal_604f3fc7395e5.pdfIn 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://uploads.strikinglycdn.com/files/fe07a880-abfc-41e6-9c15-e55a190f4941/miracle_whip_antenna_instructions.pdfIn PDF document text
    • http://mepetibewo.pbworks.com/w/file/fetch/145048263/shivji_ke_108_naam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54d3d7ca-3ac7-465f-9983-3320c2e7a329/81882308091.pdfIn PDF document text
    • http://mujusevo.pbworks.com/w/file/fetch/144480987/83275751048.pdfIn PDF document text
    • http://tinigogazos.pbworks.com/w/file/fetch/145098246/pokemon_sacred_gold_rom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/459d6243-f367-4039-8411-3523a28ed354/which_programming_language_is_used_in_kali_linux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b5877fd-b291-4e08-8016-baa75e35946d/vopakovenubezipekekanixeg.pdfIn PDF document text
    • http://zupelapowi.pbworks.com/f/examples_of_kennings_in_beowulf_with_line_numbers.pdfIn PDF document text
    • http://dodosuta.pbworks.com/w/file/fetch/145011909/numegowarudixix.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB85 5140 bytes
SHA-256: f96967fe55a866a48330829a8015d40fb6a7d1f0d043cbe3b550b193f1db5556
font_01_sfnt_off00010cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFE 11380 bytes
SHA-256: 38a789427dad7ad73ec29f90b708b634c4f3aa464aa0752423dbfd092efeebb0
font_02_sfnt_off000133cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133CB 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2