Malicious PDF — malware analysis report

Static analysis result for SHA-256 2128b36e373ba5b7…

MALICIOUS

PDF

70.9 KB Created: 2021-03-28 10:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 3ced2f47aa3849b21e4ec3cea69a3a78 SHA-1: 59a14915965e704af7d0ed477ef3ca6ede3bc18b SHA-256: 2128b36e373ba5b770c1bb2c745f35c2dae6f55aeb884e274b3191a5e5bbc771
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many pointing to disposable domains, suggesting a link farm or SEO poisoning tactic. One critical heuristic indicates a link to known malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of phishing or malware distribution attempts, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=active+and+passive+voice+worksheets+for+grade+5+pdf In PDF document text
    • http://osummer.space/cruise_critic_forum_regentr8h3a.pdfIn PDF document text
    • http://samelike.site/aws_iam_role_policy_terraformq6y6s.pdfIn PDF document text
    • http://juponuziwotaga.mywebcommunity.org/animals_and_their_habitats_chart.pdfIn PDF document text
    • http://gepopusoka.mypressonline.com/libro_cerebro_de_pan_descargar_gratis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410020/normal_6059075a143ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445880/normal_603fd8d46e152.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378836/normal_601b03e66d23b.pdfIn PDF document text
    • http://j3vnci4.xyz/manual_antibioticos_usp862ev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481069/normal_6024528d0d5dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454051/normal_6057f1e7c1920.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482424/normal_605ffddd9a32d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388063/normal_602c7fc65f48d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454811/normal_5ff66c10dcddf.pdfIn PDF document text
    • http://circus.market/it_service_management_plan_templateuj22z.pdfIn PDF document text
    • http://mibikazut.mypressonline.com/6506148105.pdfIn PDF document text
    • http://reactivaperu-2020.com/how_to_replace_trane_fan_motorz1tm1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454304/normal_6023b7fae8997.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_868c4a163c73476d85b53500e2dd916d.pdf?index=trueIn PDF document text
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_c2d20c16c032417cb26b1c8bab067ccf.pdf?index=trueIn PDF document text
    • https://46a1ac71-481d-4a85-b709-d40f3a189542.filesusr.com/ugd/143c98_c76b8dd3032c474d8690fdc0015dc002.pdf?index=trueIn PDF document text
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_2ac7ff43f8a8426eab69ed77e862f050.pdf?index=trueIn PDF document text
    • https://4b002d3c-a55f-42ce-816c-238f848e88a9.filesusr.com/ugd/3398cc_ab3eb971e8c940b8843f2b2d826bf375.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB3 5500 bytes
SHA-256: 4b022dc995e94502113944d837ade2d7564e364f41b376a94aa775fbbe171c9d
font_01_sfnt_off0000dd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7C 10068 bytes
SHA-256: 2c941f248a5e29279c1901dc9f9a856a0ead4205659deafe541ca94e814ad191
font_02_sfnt_off0000ffed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFED 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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