Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5b08ad7bc8282f…

MALICIOUS

PDF

79.9 KB Created: 2021-03-28 13:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b6af43517841e2c38b66b5fa564b8369 SHA-1: a943bbc99a928c0e552f9435115f79e7efd86fca SHA-256: ff5b08ad7bc8282f51bc865c0d060c51410dcf7d29e0b734f40e8b489a7480c3
206 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document body, though truncated, suggests a lure related to product details, but the primary malicious function appears to be a callback phishing attempt, as indicated by the 'SE_CALLBACK_LURE' heuristic. The presence of numerous external links, many pointing to disposable domains, further supports a phishing or link-farming scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://jacksth.ru/strik?utm_term=oster+a5+turbo+2-speed+professional+animal+clipper PDF link annotation
    • http://vegefojafi.22web.org/nikabifafaboba.pdfIn PDF document text
    • http://starconflict-game.ru/final_fantasy_4_after_years_android_apk3ctzd.pdfIn PDF document text
    • https://vesepuzimimewij.weebly.com/uploads/1/3/0/7/130776402/pajijerisemolak-butokove-vamojojudesabeg.pdfIn PDF document text
    • http://zipafaxelati.sportsontheweb.net/bacterias_y_sus_caracteristicas.pdfIn PDF document text
    • http://getyourcredit.info/bill_nye_sound_worksheet_freehu8qb.pdfIn PDF document text
    • http://bamefidev.mygamesonline.org/2015651769.pdfIn PDF document text
    • https://dezegumi.weebly.com/uploads/1/3/4/1/134108828/7d035a8.pdfIn PDF document text
    • http://hookup668.site/what_is_your_economic_impact_payment_card0ild3.pdfIn PDF document text
    • http://spencermcman.us/tiger_brand_rice_cooker_partswnkrq.pdfIn PDF document text
    • http://ramuwesitavoz.mywebcommunity.org/73598855472.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b998fa74-583e-446a-a2a7-67f41460fdb2.filesusr.com/ugd/e081f8_d729f8f95c68462aa941afb06d45bf41.pdf?index=trueIn PDF document text
    • http://kadizilurojiniz.onlinewebshop.net/gluconato_de_clorhexidina_al_4.pdfIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_cd87bd2984c14e4daede21e32128dd7c.pdf?index=trueIn PDF document text
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_07a9d0dcb99f426a81f339c311f1aa22.pdf?index=trueIn PDF document text
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_b5e4e34157d041aa817a8f502e875333.pdf?index=trueIn PDF document text
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_7dfae7a94fac4c1eb83478483a26cf74.pdf?index=trueIn PDF document text
    • https://e24fd148-3228-4bbf-b09f-969d600d361a.filesusr.com/ugd/3283b0_67cd53560d6b4a2d99b23e3b74df24a2.pdf?index=trueIn PDF document text
    • https://fec450ea-b80f-4746-b851-35139cc02de5.filesusr.com/ugd/53a83b_f75431e0b22f443098da2afec48e1d9b.pdf?index=trueIn PDF document text
    • https://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_50998b6fc4884cbc82c87cfe8c863cb4.pdf?index=trueIn PDF document text
    • http://kulekedeziwab.epizy.com/jizerasawazilexap.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_off0000f5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C8 5756 bytes
SHA-256: 62882b765fbfdf0b31dc01960dd20d0c1ff5c3f23f6a2a2f8584bba8f36cb0a9
font_01_sfnt_off00010951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10951 12300 bytes
SHA-256: a6bfd0d425c75d34a8af436f41348c74239f018ec52094080aaaf2ec99927ffb

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