Malicious PDF — malware analysis report

Static analysis result for SHA-256 558454b91a9a874d…

MALICIOUS

PDF

72.1 KB Created: 2021-06-01 11:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 452343677fc96ddd688f8b2a2a108df8 SHA-1: c33609771a48e12291166be1a42a845a4778f332 SHA-256: 558454b91a9a874d7922a8e1d1ca3519d29339e944b17c78a4cfa3c7c9e388ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF that contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. One of the primary links points to zajinet.ru, which is likely part of a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/123?utm_term=career+goal+setting+worksheet
    • https://static.s123-cdn-static.com/uploads/4473637/normal_5fe4ed9782078.pdf
    • https://cdn-cms.f-static.net/uploads/4427509/normal_600d72610b693.pdf
    • https://cdn-cms.f-static.net/uploads/4471249/normal_6018d4c910908.pdf
    • https://winomawapaba.weebly.com/uploads/1/3/5/3/135334931/2572551.pdf
    • https://tajurasexir.weebly.com/uploads/1/3/1/6/131606020/d9bbc.pdf
    • https://static.s123-cdn-static.com/uploads/4366041/normal_5fc578e8dd4be.pdf
    • https://sufimademum.weebly.com/uploads/1/3/4/2/134236216/1cd4ff96a.pdf
    • https://berigagagek.weebly.com/uploads/1/3/1/3/131384675/zixupajaloto_jafimas_ketuvodejub.pdf
    • https://fujimerikav.weebly.com/uploads/1/3/4/3/134307110/5753284.pdf
    • https://static.s123-cdn-static.com/uploads/4412599/normal_5ff13738d5b96.pdf
    • https://static.s123-cdn-static-d.com/uploads/4370309/normal_60b0c07b2bfa6.pdf
    • https://cdn-cms.f-static.net/uploads/4407795/normal_601a3920f2116.pdf
    • https://tibagikusutugox.weebly.com/uploads/1/3/0/7/130775046/zinelado.pdf
    • https://rixidagetowema.weebly.com/uploads/1/3/4/6/134612143/5233171.pdf
    • https://cdn-cms.f-static.net/uploads/4370078/normal_6010e6b1dce38.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ee264414-6394-415e-a0ba-955918345b00/phr_study_guide.pdf
    • https://uploads.strikinglycdn.com/files/1becd7ab-93b6-40bf-9766-06bf1d4ca00f/nikon_coolpix_s6900_review.pdf
    • https://uploads.strikinglycdn.com/files/e5846aa8-46a7-4dfa-b525-6cf7d369ac0a/jopexamusologurisilik.pdf
    • https://uploads.strikinglycdn.com/files/54bc530d-4061-485a-91c6-5039f4ccc327/28129738874.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc6e.bin
4b3f4bbe28c48ccc077a7230f40a67b04f3b0c8dc7a6e281f434c0963cd5c3ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6E 5008 bytes
font_01_sfnt_off0000ed84.bin
9e50c1ce74acfb8faf0dbd2ece7d3c2a35aa4d9e6453f436bc71aaa7ccd61e5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED84 10596 bytes

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