Malicious PDF — malware analysis report

Static analysis result for SHA-256 c59c8d1304f56011…

MALICIOUS

PDF

79.8 KB Created: 2021-04-05 12:40:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e619295d20def388855d01ce11426c3d SHA-1: bac8aa11ab0263cde91d45da491930909234bdfa SHA-256: c59c8d1304f56011f26106418b9ffc9ead589dc1ce3c2db361763ab1d2ec46a5
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://midufefew.ru/wix?keyword=backpage+alternative+websites+2018 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379054/normal_60206624d303b.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/hAs1Nji/best_crash_car_racing_game.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375361/normal_5ff4157244604.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489975/normal_600346f47811d.pdfIn PDF document text
    • https://najigojuvunijo.weebly.com/uploads/1/3/0/8/130874658/9565362.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367646/normal_605d739176bea.pdfIn PDF document text
    • https://viwejabaru.weebly.com/uploads/1/3/4/7/134749074/a1e2dfd4a1a8a.pdfIn PDF document text
    • https://cdn.sqhk.co/nexasolonit/ihjcmgi/super_mario_run_full_game.pdfIn PDF document text
    • http://tanemazijafawin.medianewsonline.com/14663729047.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456728/normal_600de4f8bd2e4.pdfIn PDF document text
    • https://wuletalevuvefam.weebly.com/uploads/1/3/1/3/131379877/2224004.pdfIn PDF document text
    • https://tibiwoxot.weebly.com/uploads/1/3/4/8/134881218/mebusipoxovurenif.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/gFtMiiL/dinuziwotovawuvalazifunef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425912/normal_5fee75c3de2b8.pdfIn PDF document text
    • http://supobesopo.mygamesonline.org/algebra_2_common_core_workbook.pdfIn PDF document text
    • https://wajabanafeku.weebly.com/uploads/1/3/4/5/134599300/tatokav-maresawebome.pdfIn PDF document text
    • https://jipujiro.weebly.com/uploads/1/3/1/0/131069764/5648915.pdfIn PDF document text
    • https://jezisivakutuxek.weebly.com/uploads/1/3/4/8/134862078/razagik-numim.pdfIn PDF document text
    • https://begopafisofebe.weebly.com/uploads/1/3/3/9/133997970/tilovowud.pdfIn PDF document text
    • https://cdn.sqhk.co/figegixo/s2Pjfez/dragon_ball_c_minecraft_mod_1._12._2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453328/normal_6041cbb03b467.pdfIn PDF document text
    • http://zizodoroluxonaf.sportsontheweb.net/25972894349.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kavibajegis.onlinewebshop.net/rock_and_roll_snowman_instrumental.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_off0000f7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E6 6024 bytes
SHA-256: cecb0f5046d558b5f0f8af689bf892a96963b3dcb92d107a4a884e0f0dbf19b6
font_01_sfnt_off00010c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C90 10980 bytes
SHA-256: 73766335fbc69c6195013e8606e00c1d1db8ade5ee3b800e6eefbdf75af85b21