Malicious PDF — malware analysis report

Static analysis result for SHA-256 1149a2b920ec7924…

MALICIOUS

PDF

115.7 KB Created: 2021-03-19 20:50:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d8d6756e4d633182af518d409e3233b1 SHA-1: b262465b902f621052b1263208960895ca7b2c38 SHA-256: 1149a2b920ec7924c04ee5c79635596cd9edc7142876d29bf2505f6a7d174ee2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous external URLs embedded within its content. The primary URL, 'https://seumenha.ru/award?keyword=belajar+tulisan+mandarin+pdf', suggests a lure related to Mandarin language learning, likely to attract organic traffic or users searching for specific content. The heuristic firings indicate a significant number of external links, many hosted on disposable domains, pointing towards SEO manipulation or phishing tactics. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, potentially leading users to malicious sites.

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://seumenha.ru/award?keyword=belajar+tulisan+mandarin+pdf PDF link annotation
    • https://mefuwowenapes.weebly.com/uploads/1/3/4/6/134611128/kojavifozoj_satojolaba_dudezikositik_tunekatebetase.pdfIn PDF document text
    • https://zusajozaza.weebly.com/uploads/1/3/1/3/131381142/84a544018223ab9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490542/normal_6035e3d165732.pdfIn PDF document text
    • https://buriviniroxino.weebly.com/uploads/1/3/1/6/131606563/niguvuwajakuv_nosisaxapi.pdfIn PDF document text
    • https://zogozunenu.weebly.com/uploads/1/3/5/3/135399222/fujule_vupadefi_getot.pdfIn PDF document text
    • https://patoduwewoz.weebly.com/uploads/1/3/1/4/131483118/lajapusanon.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/093c4c84.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478683/normal_5fc945ae74eea.pdfIn PDF document text
    • https://risogaruwakev.weebly.com/uploads/1/3/4/6/134634919/9c876549487.pdfIn PDF document text
    • http://samubed.iblogger.org/l_ergonomie_au_bureau.pdfIn PDF document text
    • https://regezubigif.weebly.com/uploads/1/3/5/3/135320660/sunosuxixolir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374522/normal_5fce58c8a1654.pdfIn PDF document text
    • https://pufodafu.weebly.com/uploads/1/3/5/9/135959320/3885390.pdfIn PDF document text
    • https://jolidezebixisu.weebly.com/uploads/1/3/3/9/133997790/gijozuvuda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6161bc5f-73da-413b-b81a-c73226a96020/wheres_waldo_vans_collection.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60c54e99-140d-4c5f-843e-f278108b44c9/fl_studio_tutorial_download_pc.pdfIn PDF document text
    • http://jemudizibumak.epizy.com/cabelas_dehydrator_owners_manual.pdfIn PDF document text
    • http://rewifavad.epizy.com/channelling_my_spirit_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4464ae40-537f-46c4-aebe-3f5e0fe455f3/shepherding_in_biblical_times.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/053c1195-f4b6-47ce-bff2-ae102dbddb96/corona_kerosene_heater_price.pdfIn PDF document text
    • http://zagizub.rf.gd/27876869449.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f12e579-eef4-41a5-8821-08106dcfeab1/64071022592.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aea4b68-75a1-40be-b91d-796a426e4895/gokepurefatap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19864ab1-ae13-49f3-81ec-3731aba6515b/62109528174.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_off00014e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E8E 16292 bytes
SHA-256: be8ac37a3fe71102196ebda7dfe05e51b4f728d3431095d42599754bf3547ead
font_01_sfnt_off00018281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18281 5312 bytes
SHA-256: e455c9a35cf7079755494a32e111e9aab90e381f77f59ac520549a96161f181c
font_02_sfnt_off00019481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19481 15268 bytes
SHA-256: c044f02d9e301c05e1d525302eb2a4fe04034450218767241e54a0d5e8451e12

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