Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c43a9105d28b168…

MALICIOUS

PDF

74.0 KB Created: 2021-03-25 11:54:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8957a696cea6b670748977633b801437 SHA-1: 5c9b49c25e9a4c2f5cfc43383effbb6f7021fbe7 SHA-256: 3c43a9105d28b168276176e4723d8f71954f8ccf1becc9e0fd9ab8565eedfb3c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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://bologen.ru/strik?utm_term=who+is+the+minister+for+services+australia PDF link annotation
    • http://cabinetsop.xyz/chale_aana_lyrics_wapwonnr2b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445743/normal_605709a399b61.pdfIn PDF document text
    • http://wide-mean.top/51527413308n7h3j.pdfIn PDF document text
    • http://limaxinsto.xyz/rifimivoviwumawogotatikxq81.pdfIn PDF document text
    • http://ilkertr.shop/accuair_elevel_installation_manual8v08u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500665/normal_600ffbbfaee1b.pdfIn PDF document text
    • http://leree4.club/three_view_orthographic_drawings86bj.pdfIn PDF document text
    • http://lenudes.com/terraria_diving_helmete6di6.pdfIn PDF document text
    • http://scoretdho.best/cuanto_es_120_gr_en_tazaszyyfv.pdfIn PDF document text
    • http://cetop.xyz/106636007269hbc0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_d8370e716d4c405891715ba4883886bf.pdf?index=trueIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_a3f7e293eafe4fdcaaf0ced44799def2.pdf?index=trueIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_b2d2ac4e293f49ee9b5e0d3fa728a606.pdf?index=trueIn PDF document text
    • https://4c6480a9-ccec-4c20-853c-cc48681c44ad.filesusr.com/ugd/935adc_d89e8f3ef77947d6bfc34f6ca9968f06.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/feb9f984-9e0b-4f49-95df-c6b7b95c304e/48406871966.pdfIn PDF document text
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_2a576f65f3354ebead1ee3aaa4cd6329.pdf?index=trueIn PDF document text
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_c717353488624e48bca2564cf02cee91.pdf?index=trueIn PDF document text
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_b19fb3a371884396952a2e0bd33b27f5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/24940cc2-eefd-44da-af29-f5f019eb38fa/the_better_business_bureau.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c6b8761-2d2d-4ba5-82db-c7d5b25a1d89/83340685932.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_off0000e3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AB 5192 bytes
SHA-256: 2e7953098b8aab9d90b56279750e728e171c232d6dc52d630f4561c371490907
font_01_sfnt_off0000f53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53C 10432 bytes
SHA-256: 85275b88a507955f5c9794fbccecad86aba54fdc9347362a8093547ea257da13

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