Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3fa5d106c25784c…

MALICIOUS

PDF

78.7 KB Created: 2021-03-23 05:12:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a4305e91075c25834c838451866efc8d SHA-1: 2dd41cf200c6a59d5b090050b7a1cd09fb50302d SHA-256: a3fa5d106c25784c0aff0ae50115824fa4ad2e04caf155a0c07ed67eef00541a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=youtube+diy+face+mask+with+ties+fitted+nose+and+filter+pocket PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376625/normal_603856eb37af8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482418/normal_5fe64fdd06bff.pdfIn PDF document text
    • http://libertinemodels.com/157412098881vjdj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416927/normal_5ffae81440d07.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368954/normal_5fe54d294ba2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427821/normal_6043c0bfc2dc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422385/normal_601e76e08009c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462730/normal_600368edccda6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422147/normal_5ff0bdd614e8c.pdfIn PDF document text
    • http://lnstagram-helping-centre.com/matematicas_6_primaria_santillanaqjr74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413456/normal_6044a4ff5d1ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473971/normal_600ebce37cd41.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_f4e0ce2b85ff43f783bd2df1691196c1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2da672c8-9012-4e38-ab5d-cbecd3fcb449/how_to_apply_for_military_reserve_retirement.pdfIn PDF document text
    • https://c03439ef-6557-4199-865e-586791a52b6c.filesusr.com/ugd/6bb4a2_f6676ee8592e49e0bac26e8f53ca6953.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/924483bd-3de6-4528-b859-daccd6568e64/how_to_show_demographic_data.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f71faf5-806f-47da-b1f9-b48c0da0910b/cuanto_equivale_200_gr_de_azucar_en_tazas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9542f159-b039-4eb8-9bd4-063f0b694253/what_is_the_first_step_in_consumer_decision_making_process.pdfIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_393348998f85461a8bcce6018910f6e7.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C9 5756 bytes
SHA-256: 23ebe8653f545dbe367ad2fbdfbafd7cb26566874b2b340f221b662e1415aade
font_01_sfnt_off00010452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10452 11380 bytes
SHA-256: 24c4ac61b7afdb8a4a5ce2876b581b3086fe1a6621d49b2758b4bf7520621bd3

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