Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4412989d01e641…

MALICIOUS

PDF

77.5 KB Created: 2021-03-24 01:40:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53cc4d76047665fd68f27540cf99fb4c SHA-1: bf4d892d4ac371a7fe2f8f98463dd5eb6de18532 SHA-256: ff4412989d01e641bdf44a8ef068df84a16e0998f6fd6c600e26de7e3f88536a
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external websites, many hosted on disposable domains. The primary URL, 'https://ponafet.ru/123?utm_term=definicion+de+carboxihemoglobina+pdf', suggests a phishing or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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
  • 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://ponafet.ru/123?utm_term=definicion+de+carboxihemoglobina+pdf
    • https://pugiputofal.weebly.com/uploads/1/3/4/7/134740318/joneruxifik_finutaguxob_bigadeji.pdf
    • http://good-production9.site/evolutionary_perspective_examples_in_humanskggow.pdf
    • https://tisawisapapaw.weebly.com/uploads/1/3/5/3/135326074/talobufufujalesasud.pdf
    • https://nirejabepifu.weebly.com/uploads/1/3/4/2/134266024/7488182.pdf
    • https://cdn-cms.f-static.net/uploads/4384050/normal_603ec5f6bd8a8.pdf
    • https://dotanivim.weebly.com/uploads/1/3/4/7/134705276/9872234.pdf
    • https://cdn-cms.f-static.net/uploads/4459464/normal_604b782305aaf.pdf
    • https://tilejawerez.weebly.com/uploads/1/3/4/7/134709016/dolesoxelikoriv_fixoxufel_pebanilunoxe.pdf
    • https://tagojakiwuki.weebly.com/uploads/1/3/4/4/134444274/4904767.pdf
    • https://guwawafike.weebly.com/uploads/1/3/5/3/135338161/4674332.pdf
    • http://nizavevorupuj.mywebcommunity.org/gofunujugejujikisitidokuz.pdf
    • https://tonavamajarow.weebly.com/uploads/1/3/4/6/134694337/561586.pdf
    • http://sportplays.ru/90346493289ht41f.pdf
    • http://g2am2e.xyz/instagram_highlights_iconqtc8y.pdf
    • http://ru-order-687646765445.art/nikon_ml-l3_remote_control_compatibilityoaukd.pdf
    • https://static.s123-cdn-static.com/uploads/4379961/normal_6009882bcf005.pdf
    • https://lonunirixug.weebly.com/uploads/1/3/2/7/132710494/8751602.pdf
    • https://jamelowo.weebly.com/uploads/1/3/1/6/131606155/xofobuxe_josadoriwijizoz_pekesis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ca614bef-52f2-481d-bf1a-e48bb7ef0fdf/72591018032.pdf
    • https://uploads.strikinglycdn.com/files/2a274a6d-c50d-4ae5-8c1d-f2837f78f078/88372704071.pdf
    • https://uploads.strikinglycdn.com/files/3bad368f-b21a-4703-afea-e2256ed7057e/relative_clauses_perfect_grammar_exercises.pdf
    • https://uploads.strikinglycdn.com/files/575bb67b-1141-4257-9f40-c3c1ae791a1d/gagom.pdf
    • http://tuxefunuzire.atwebpages.com/bivuf.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_off0000ec61.bin
107cc30bf085c96e579e5402049031c68ce29537d39be2ecd01199fd23528a0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC61 5600 bytes
font_01_sfnt_off0000ff4a.bin
55b6018906a1f00993efc9a60b0d4cc83b78682d2c34e745992a3c2d91597259		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4A 12088 bytes

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