Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca605e81a8db799…

MALICIOUS

PDF

78.1 KB Created: 2021-04-17 14:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1c146ae047c5e0922795c60fe2a6b95f SHA-1: 098e7426d891c7c5d72a4d696e1a22a7e8816a5d SHA-256: 5ca605e81a8db799fe68fa5818b6434f7c9981cca6771b80ca368f4282630379
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The embedded content, though obfuscated, likely serves to redirect users to these external URLs, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://golowaki.ru/strik?utm_term=what+nail+shops+are+open+now PDF link annotation
    • http://ig-verifiedsbadge.com/10102506459dj8yv.pdfIn PDF document text
    • https://bovakexigi.weebly.com/uploads/1/3/5/3/135314068/jovavesisaro.pdfIn PDF document text
    • https://lonugawewubosil.weebly.com/uploads/1/3/4/6/134627014/jezur_koxewaxi_putorobalegid.pdfIn PDF document text
    • https://kawavaturitavo.weebly.com/uploads/1/3/5/3/135321378/dcec4420.pdfIn PDF document text
    • http://8gusevshop.website/giving_directions_exercises_with_answersh888d.pdfIn PDF document text
    • http://sevastopol.sale/what_landforms_are_unique_to_australiag0hws.pdfIn PDF document text
    • https://vorexumezekadan.weebly.com/uploads/1/3/0/9/130969740/2057419.pdfIn PDF document text
    • https://xolivura.weebly.com/uploads/1/3/5/9/135958321/0d66566b3191.pdfIn PDF document text
    • https://gajitiromivalot.weebly.com/uploads/1/3/4/4/134475956/2642926.pdfIn PDF document text
    • http://lozhobelir.space/saitek_x52_pro_profile_star_citizenntv16.pdfIn PDF document text
    • http://burrrhey.tech/rune_magic_trainer_outwardvp0xw.pdfIn PDF document text
    • https://xomowozijirogap.weebly.com/uploads/1/3/4/6/134667332/3040702.pdfIn PDF document text
    • https://wivevesatowot.weebly.com/uploads/1/3/0/8/130813399/fonosopewa_nigobekozazam_losedixatum_vowigubaxis.pdfIn PDF document text
    • https://rebolaje.weebly.com/uploads/1/3/4/6/134696551/xufexewenogez.pdfIn PDF document text
    • https://nirulutot.weebly.com/uploads/1/3/4/7/134700174/rubusopudorule.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a208a2de-cee2-48c2-86e3-c620a022946d.filesusr.com/ugd/dda32d_9a1a84f4f3054c668e11784cea66887a.pdf?index=trueIn PDF document text
    • https://6196a4e6-b3b5-4a85-a139-4ec84e0a53d9.filesusr.com/ugd/d01287_29cff0220c1a448194c5d63364531087.pdf?index=trueIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_a685c8f655da40ae9f9aace2a9776589.pdf?index=trueIn PDF document text
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_913d4d29d2f54e619ba9c428c2a41e52.pdf?index=trueIn PDF document text
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_f5980019e0df437e8c75c4ad365627d6.pdf?index=trueIn PDF document text
    • http://ruxukakex.rf.gd/abandoned_cart_reports_for_woocommerce.pdfIn PDF document text
    • http://tejojode.rf.gd/65226403299.pdfIn PDF document text
    • https://6323cc82-cf72-43ae-bc7a-f8d691a1d37e.filesusr.com/ugd/4f3578_1b9b7c0c42004677b15852a08ee05acf.pdf?index=trueIn PDF document text
    • http://wiwazojugumume.epizy.com/french_revolution_essay.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_off0000f5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 5012 bytes
SHA-256: 621c31e5009bcc600acac302b46261a3e7bea5a37f7fb1059bfed5673d293431
font_01_sfnt_off000106ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EA 10548 bytes
SHA-256: 835f82b411040573f7010e3400f86eda510b098ee373df62c074b7aa6ca5e796