Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a57c98a92ad207…

MALICIOUS

PDF

74.7 KB Created: 2021-03-01 09:35:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 927561a38a16a2e99388608923fc93b1 SHA-1: c1a66e7af823a1f388e6d6a29870d4065b8b8767 SHA-256: c5a57c98a92ad207002f937bbef8691480ffe0b180f1fad1c97e5ad361784de1
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 of which are hosted on disposable domains or link farms, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest this is a phishing or trojan delivery mechanism. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to download further payloads or redirect to malicious sites.

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.
  • 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://mezovuduw.ru/strik?utm_term=asus+sabertooth+z77+graphics+card+compatibility PDF link annotation
    • https://lomimasexoguxi.weebly.com/uploads/1/3/4/7/134736135/1240610.pdfIn PDF document text
    • https://cdn.sqhk.co/nejajevafode/xhb6gjh/49698678167.pdfIn PDF document text
    • https://cdn.sqhk.co/devurekon/iQtq4jj/napipuj.pdfIn PDF document text
    • https://cdn.sqhk.co/rosomugimo/ghsji7U/93681991978.pdfIn PDF document text
    • http://vuwimoxit.mygamesonline.org/lisoxikudorepamodetijuli.pdfIn PDF document text
    • https://cdn.sqhk.co/gabisolovima/lGii6ha/alpha_guns_free_hack_game_download.pdfIn PDF document text
    • https://tovuwofox.weebly.com/uploads/1/3/4/7/134731163/pafenofelelemixuxado.pdfIn PDF document text
    • https://cdn.sqhk.co/laxegipo/sWbY1he/lasership_locations_in_florida.pdfIn PDF document text
    • https://cdn.sqhk.co/lemisobe/IihJhc2/30945826277.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/agile_project_management_training_near_me.pdfIn PDF document text
    • http://kixurox.getenjoyment.net/lozosipu.pdfIn PDF document text
    • https://lurufabufukigo.weebly.com/uploads/1/3/1/4/131407807/tigemizo-makewale-sinesiwire-saradile.pdfIn PDF document text
    • https://cdn.sqhk.co/laxefotogulo/jhayZid/razezor.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/ruxavekutum.pdfIn PDF document text
    • https://cdn.sqhk.co/mejofiwog/gjeUii4/monster_energy_supercross_game.pdfIn PDF document text
    • https://lokevevivepino.weebly.com/uploads/1/3/4/1/134131736/1100800.pdfIn PDF document text
    • http://bewewafip.scienceontheweb.net/is_the_phillips_curve_still_relevant_today.pdfIn PDF document text
    • https://bojibelatos.weebly.com/uploads/1/3/4/0/134040608/abcacfbe4dcba5e.pdfIn PDF document text
    • http://lirinevewafa.mypressonline.com/calories_dunkin_donuts_power_breakfast_sandwich.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE433 5848 bytes
SHA-256: a8e0585887ecc4806ed20c031f04b77067111c2875120bfb0153b79cb404b129
font_01_sfnt_off0000f80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80A 10800 bytes
SHA-256: dbc25a1c7c93cdcd0cffc509bba2019a001c9477f02de1845a754e72bc78acb8