Malicious PDF — malware analysis report

Static analysis result for SHA-256 f21810050297a574…

MALICIOUS

PDF

62.4 KB Created: 2021-02-13 18:15:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 874e92e9a8209efe73d5ec22d997411d SHA-1: 6eb0a54a93659557d6ca92ad5f49b3b9fdec4c19 SHA-256: f21810050297a574377ab4f827171c6a5bc2dde7c49df73b2e008d53f69c9227
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme to host malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document for using disposable hosting and UTM parameters, common in phishing or malware distribution campaigns. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://seumenha.ru/aws?utm_term=cursive+u+lowercase+worksheet PDF link annotation
    • http://cloudplay.xyz/present_tense_of_er_verbs_worksheet_answersbv6ts.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447434/normal_5ff8aa3ea456a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467298/normal_600fc2f1b2563.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445570/normal_601467a546cb5.pdfIn PDF document text
    • https://cdn.sqhk.co/tunaluvum/dhaHBgY/nail_polish_color_ballet_slippers.pdfIn PDF document text
    • http://glasshookahcatering.com/wild_mushroom_guide_ontario2z2aj.pdfIn PDF document text
    • https://cdn.sqhk.co/sotisajen/Wiaivif/lucky_plinko_big_win.pdfIn PDF document text
    • https://cdn.sqhk.co/fogobewataja/5lMrNjf/17020904037.pdfIn PDF document text
    • http://unityfree.xyz/999083384669pcib.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/exggjcl/business_management_major_average_salary.pdfIn PDF document text
    • https://cdn.sqhk.co/boxumiza/geJhhhi/mermaids_fayetteville_ar_72703.pdfIn PDF document text
    • http://infokurs.design/91636643787loeba.pdfIn PDF document text
    • http://sodalabs.club/search_only_files_googleysr8x.pdfIn PDF document text
    • https://cdn.sqhk.co/banijuwa/ggdjeHo/nojazilexibavorifuwuxi.pdfIn PDF document text
    • https://cdn.sqhk.co/pufowuvikij/lihggW2/melizepurebav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/86377400690.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/6952128889.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/contract_termination_template_uk.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_off0000ba7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA7B 5008 bytes
SHA-256: 0b2c9bfe8be0b7a1a6511569ee2112551e4d212f08f1fe982fbcb5bf612e08ee
font_01_sfnt_off0000cb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB91 9668 bytes
SHA-256: e1c5668dd64a3105105c93c6cce697c64f41e53d0e9dd2e45261905d97e397f5

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