Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc21b0a1918be2f…

MALICIOUS

PDF

71.2 KB Created: 2021-02-17 18:32:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4a9ab3bb9aa45ecfddf21f71d82c69c9 SHA-1: d42267439c53aa7eb986afcfa5634a746cd61dab SHA-256: dfc21b0a1918be2f6e6c47689c01d2dae5bd85268874d275186b7c9415e75988
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for a link farm containing numerous external URLs. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to a large number of external websites, likely for phishing or SEO spam purposes. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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://bologen.ru/aws?utm_term=my+zone+headphones+only+get+radio PDF link annotation
    • https://fadufavibog.weebly.com/uploads/1/3/4/8/134889314/9768361.pdfIn PDF document text
    • https://mupililoxer.weebly.com/uploads/1/3/5/3/135302313/02c30f.pdfIn PDF document text
    • https://cdn.sqhk.co/patemugimej/jjRhhib/guilty_synonym_noun.pdfIn PDF document text
    • https://dubiroki.weebly.com/uploads/1/3/1/4/131483307/9003703.pdfIn PDF document text
    • https://xupodidif.weebly.com/uploads/1/3/0/7/130739682/4669716.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/jcgcEij/wodewuganidetojapasened.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/Sfjihdt/langley_fcu_mobile_deposit_faq.pdfIn PDF document text
    • https://nujokolove.weebly.com/uploads/1/3/0/8/130874035/volodidifo_wuradaf_resodipeki.pdfIn PDF document text
    • https://cdn.sqhk.co/damukowabij/hdjcicj/animal_restaurant_game_tips.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://warufadul.rf.gd/72974028566.pdfIn PDF document text
    • http://gotazuvibidok.epizy.com/animal_science_worksheets_for_1st_grade.pdfIn PDF document text
    • http://murobalebijuge.rf.gd/juzuzolavujorolatomumuw.pdfIn PDF document text
    • http://sipariwemarisu.rf.gd/google_slides_templates_business_plan.pdfIn PDF document text
    • http://vuriruzuminomu.epizy.com/rs3_fishing_skill_guide.pdfIn PDF document text
    • http://rovarede.rf.gd/case_study_example_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/96040704035.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC721 5380 bytes
SHA-256: 6a720167117fe2df0b0af58df7b470e9087a966432f87df2014eb2d20acf9201
font_01_sfnt_off0000d982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD982 10156 bytes
SHA-256: d731ddab30b02fd62e1b890453e149afd3da0b62aa55ff98a417da04a7fde985
font_02_sfnt_off0000fca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA1 5384 bytes
SHA-256: 44838663a142238273830be76c7b352c8346c185e4bfa2c9ddb6fbba1d87d9da

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