Malicious PDF — malware analysis report

Static analysis result for SHA-256 c870cbdc69b97342…

MALICIOUS

PDF

78.3 KB Created: 2021-06-08 20:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 587bb176160cc18a7b0911dad4692f77 SHA-1: 51e9d5ba0767963955356e0161ca1bd700134cf6 SHA-256: c870cbdc69b973428475cf2ee64870ee50a19ffee86e004c07903e378a9df3df
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are to other PDF files, suggesting a link farm designed to attract traffic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/pbw?utm_term=varane+avashyamund+movie+download+torrent
    • https://cdn-cms.f-static.net/uploads/4370996/normal_603a7353a6a8f.pdf
    • https://cdn-cms.f-static.net/uploads/4483623/normal_604dda0a0c59b.pdf
    • https://mojakoxo.weebly.com/uploads/1/3/0/7/130739052/9388546.pdf
    • https://bimipesetasezi.weebly.com/uploads/1/3/4/0/134017520/05038e85d1.pdf
    • https://cdn-cms.f-static.net/uploads/4372673/normal_600a2479deaa2.pdf
    • https://static.s123-cdn-static.com/uploads/4417212/normal_5fcc7d43715af.pdf
    • https://static.s123-cdn-static-d.com/uploads/4408197/normal_60b6fdfbd419b.pdf
    • https://zitidifomeki.weebly.com/uploads/1/3/1/4/131412181/8822143.pdf
    • https://bonawoxe.weebly.com/uploads/1/3/3/9/133986387/xivisup_jogelafaxu_pebunorikoma_wafonekuravava.pdf
    • https://cdn-cms.f-static.net/uploads/4417664/normal_601fc97aa794f.pdf
    • https://kasewipiliri.weebly.com/uploads/1/3/4/9/134901701/8910006.pdf
    • https://cdn-cms.f-static.net/uploads/4489251/normal_60b91fc170916.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d94b807a-9455-4f98-bc54-1cb26ef3b5be/world_of_darkness_books_for_sale.pdf
    • https://uploads.strikinglycdn.com/files/7cbd3ed6-7a82-42f7-bbd2-7ef1ce98b267/jesitarobuliguweges.pdf
    • https://uploads.strikinglycdn.com/files/b01e399e-fa8b-4445-8f65-4aa2ba75dfc9/nivawuxaludelobil.pdf
    • https://uploads.strikinglycdn.com/files/110eb5e7-15fe-4fd8-81d5-f4914bec80c1/stihl_56hl_petrol_long_reach_hedge_trimmer.pdf
    • https://uploads.strikinglycdn.com/files/0afc5a8b-888a-4344-b066-73a310560dc9/73070277732.pdf
    • https://uploads.strikinglycdn.com/files/9f7f2d7a-d255-4d22-866c-a3e8861b1e8b/4047754536.pdf
    • https://uploads.strikinglycdn.com/files/8aa98bdd-2eab-4d7f-b7e5-e55c3f1098e2/jatumadid.pdf
    • https://uploads.strikinglycdn.com/files/bb4fc007-5f01-4a7f-bfe0-4493ea6cd976/91333353014.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dee9.bin
6f733b654edab91f88a4c6fae02f145fd3136b61c0d5a319f116a5c0e18739c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE9 5284 bytes
font_01_sfnt_off0000f0d3.bin
72d08f72ca0ca0061ca2e638c67822f5a897bc71073fd9dfcad74d93156cd865		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D3 10624 bytes
font_02_sfnt_off00011533.bin
73f6f760a67782f27700c3ed047511a210a1e3765a9cc4fd416c63ff6a2522af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11533 16060 bytes

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