Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cc641492b91bfdd…

MALICIOUS

PDF

82.2 KB Created: 2021-05-18 22:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8151d70ed06e19b3f955b3d7b2ffb494 SHA-1: 730d3947d26cf196e89bf10bc0295930db527ef8 SHA-256: 6cc641492b91bfdd4fc3bbb666aafb381fa3c9427d4b4b880641138e96e3dbf5
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a mass of external links, many pointing to S3 buckets, and one specific redirector URL, 'https://botokaw.ru/strik?utm_term=what+do+the+chrysanthemums+represent'. This pattern is indicative of an SEO link farm or phishing lure designed to drive traffic to a malicious site. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://botokaw.ru/strik?utm_term=what+do+the+chrysanthemums+represent PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4402032/normal_5ff934a43bc3a.pdfIn PDF document text
    • https://fekoguto.weebly.com/uploads/1/3/4/4/134491689/fojazoziwusase.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393348/normal_604271f151414.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466408/normal_5fe18e28109e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477409/normal_6069834f82802.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374188/normal_6066a3f59f57f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455406/normal_5fed5ac8415de.pdfIn PDF document text
    • https://rupubonu.weebly.com/uploads/1/3/0/7/130739332/pulelidi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/telasebisu/47942573691.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/vetozeveperer.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/elementary_linear_algebra_howard_anton_11th_edition_solution_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/40387519157.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/anti-_gravity_the_dream_made_reality.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/experienced_teacher_resume_template.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/43818037877.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f36af6b-8443-4d10-8a55-f28931089dd6/99694324916.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/orion_cooker_turkey_breast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da041dbe-1680-4d29-a55f-bc8b93da45d6/30029737265.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/givimavagamix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c36ee91-2df0-4bce-88cb-b6c61a941054/62789755512.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/volumoropowexafopul.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001047c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047C 5396 bytes
SHA-256: 915fb7245d9a4c8fe413ff9b325993f244ec8887a389cf823ad94c612a3c0ece
font_01_sfnt_off000116be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BE 10784 bytes
SHA-256: 76d4c1a680918548d10d9c9f62e7add2257e40097c4b2b6437a6825440af9e64

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