Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eb2d68f8ceb9a8b…

MALICIOUS

PDF

79.1 KB Created: 2021-03-12 15:06:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8d51f4af987fc0c869b86b615c18cd0b SHA-1: 0e24eb17eb4bf1ee638aaf25c6162ed94c276e28 SHA-256: 9eb2d68f8ceb9a8b9c3a272ab62f74b7f8a8ddb74f1c2fb1f59b1e182bd2c05e
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which are part of an SEO link farm designed to appear as legitimate search results. The primary malicious URL, 'https://midufefew.ru/award?keyword=ramayana+short+story+in+english+pdf', is presented as a lure for a 'Ramayana short story in English PDF'. This URL redirects to a phishing site, as indicated by the 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristic and the 'CLAMAV_DETECTION' finding. The ML classifier also strongly suggests maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/award?keyword=ramayana+short+story+in+english+pdf PDF link annotation
    • https://fofomakizu.weebly.com/uploads/1/3/0/7/130775640/mefafojutunobox-mupedaluzokulus-joguwu-tamolad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448718/normal_60094a16d4709.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420617/normal_6040b14763f8e.pdfIn PDF document text
    • https://pevolevu.weebly.com/uploads/1/3/1/6/131606362/4b35e83ce947a.pdfIn PDF document text
    • https://cdn.sqhk.co/vafodagusun/jbhgyLb/du_transfer_application_deadlines.pdfIn PDF document text
    • https://vokarojunez.weebly.com/uploads/1/3/2/6/132696330/xejaxakiguxibojif.pdfIn PDF document text
    • https://cdn.sqhk.co/jepogedofuz/1ieghij/13385880271.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_3dcf35f3fabf4e269460d0ba4fc1a16f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/73692871701.pdfIn PDF document text
    • https://201a0bc5-0eb3-4135-8969-828875a6b07d.filesusr.com/ugd/607883_fc66e91f329d4405904cb36db79e8c1c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/legenapi/numivekamu.pdfIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_ea7a2ad632064be6a7d271813441e0f7.pdf?index=trueIn PDF document text
    • https://e6f9d1db-9bad-45ba-a188-0e8e378e8087.filesusr.com/ugd/99b222_ca789b8b90b2481989bb8d20962d3df0.pdf?index=trueIn PDF document text
    • https://9305c775-266c-4126-9ef9-90a5cffee957.filesusr.com/ugd/c3f88d_23a2f48658354ee789f499b9ed9c29b1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wujapu/sengoku_basara_4_ppsspp.pdfIn PDF document text
    • https://s3.amazonaws.com/posaxugidut/cassandra_tuning_guide.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_off0000f9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C6 5564 bytes
SHA-256: b88fa438cfc0ed8c0d2c5981d4da7ba9768a90360ebe6ab4c0485350839dbd90
font_01_sfnt_off00010c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9F 10196 bytes
SHA-256: 9f191dad236734bfa1f1e45a434091cab39c6938005f37a6ba270118ea126cfb

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