Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f111fa312b56bb9…

MALICIOUS

PDF

74.3 KB Created: 2021-03-27 11:50:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 34e41ac76dc5d8df5c2480ae78411cdf SHA-1: d36af06cd48279109b5c42f061edd61342e7d120 SHA-256: 6f111fa312b56bb912e3304f0a73c05484367ba9c588c5b91b699f73da6656ff
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains references to academic documents, which is a common lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pelibifir.ru/123?utm_term=ilm+ki+dunya+matric+date+sheet+2018 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459163/normal_5ffb39e5a5dcc.pdfIn PDF document text
    • http://lovechat24.club/how_to_build_a_hybrid_mobile_appd28rf.pdfIn PDF document text
    • https://zojegidaluvimov.weebly.com/uploads/1/3/4/1/134109086/mikif-wotar.pdfIn PDF document text
    • https://vufofameti.weebly.com/uploads/1/3/0/8/130874118/8304189.pdfIn PDF document text
    • https://cdn.sqhk.co/valujoper/wgeieW2/2210340547.pdfIn PDF document text
    • https://cdn.sqhk.co/gijimexuv/iaQorhb/gajozaritadusimij.pdfIn PDF document text
    • https://gimisezijumini.weebly.com/uploads/1/3/1/4/131453276/7007688.pdfIn PDF document text
    • http://vipmanmarket.space/what_is_posture_and_body_orientationtwdss.pdfIn PDF document text
    • https://dinijituwit.weebly.com/uploads/1/3/1/6/131606252/5960964.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487007/normal_5fcacf021dc66.pdfIn PDF document text
    • http://sreda.city/barejemiperid4z97u.pdfIn PDF document text
    • http://stonersfranchise.com/big_green_egg_grill_cover_medium7rlr6.pdfIn PDF document text
    • http://segway-wheelchair.ru/peerless_hydrostatic_transmission_repairrvec7.pdfIn PDF document text
    • https://cdn.sqhk.co/furugilenu/urjiu6e/funny_captions_for_group_photos_with_friends.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482671/normal_5feceda110d27.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/jpSMKif/brick_breaker_fun.pdfIn PDF document text
    • https://cdn.sqhk.co/resozasevej/jhgbgf2/68746838640.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvuvidova/hbijhc7/now_wallet_pruvit.pdfIn PDF document text
    • https://cdn.sqhk.co/zimogemage/5Gigcic/baby_shower_templates.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388038/normal_6028f6a1e684d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3485775d-af35-4505-8fb4-f6750f575e04.filesusr.com/ugd/42f18e_115042c6d8a042219f7f58072839e703.pdf?index=trueIn PDF document text
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_3dfb8f727b424157bb898c49e16516bb.pdf?index=trueIn PDF document text
    • https://5b5cf7c4-d983-4e27-bd54-44d52fc9074e.filesusr.com/ugd/2f9450_1f1a74918f06416dac71274c4d4247dd.pdf?index=trueIn 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_off0000e40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40E 5804 bytes
SHA-256: 8421da08906f3974c0163148c9f7d99f2ec4c4a0e6f0beb312557a39ab4b0236
font_01_sfnt_off0000f7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AA 10476 bytes
SHA-256: 4cab7c733d75e19edae4a195224a60fe9d55232e149683499330ead33b5e1465