Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42aed359dfe55b0…

MALICIOUS

PDF

96.7 KB Created: 2021-03-16 07:41:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a8f08185e3bbf104dc4363e637d77d45 SHA-1: 8ccc2380f2cb3ebed54133c40182a8ac1498b245 SHA-256: f42aed359dfe55b05de0009873187e32b44194089b6a0f6e478ce62f0cfc6e80
126 Risk Score

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 0.9998

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://gimoguvi.ru/wix?keyword=basic+bible+doctrines+for+youth PDF link annotation
    • https://cdn.sqhk.co/boxewemutox/hdid2jh/russian_driver_simulator_hd.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/jehbhij/5496139376.pdfIn PDF document text
    • http://viniveba.mywebcommunity.org/gifawetuwena.pdfIn PDF document text
    • http://nositadox.mypressonline.com/bengali_to_english_translation_book.pdfIn PDF document text
    • http://bumawusuka.mypressonline.com/what_is_pbl_medical_school.pdfIn PDF document text
    • https://cdn.sqhk.co/fularulojoze/km2ijhl/island_king_lyrics_by_tenelle.pdfIn PDF document text
    • http://bbcua.site/how_to_do_a_back_flipzstyw.pdfIn PDF document text
    • https://cdn.sqhk.co/neratimo/e4hbGkR/pacific_wings_switch_review.pdfIn PDF document text
    • http://dimozakebaba.scienceontheweb.net/tippmann_a5_cyclone_feed_problems.pdfIn PDF document text
    • http://pedagodogiko.getenjoyment.net/72478154948.pdfIn PDF document text
    • http://findattime.com/xerosadowuxibulapemipoxot1akq0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://samajusinifako.atwebpages.com/44399857846.pdfIn PDF document text
    • http://pabotojixupi.atwebpages.com/cambridge_pet_exam_practice.pdfIn PDF document text
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_b0c007f80d2c4f32b7f9fc217dae8c53.pdf?index=trueIn PDF document text
    • https://b2f3f1fb-4f3f-4d5d-be65-f5b10dce6288.filesusr.com/ugd/735189_f624a158fa1742edabaa0c6b38aac0e5.pdf?index=trueIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_f23df41b207d491dba461277d192b3aa.pdf?index=trueIn PDF document text
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_55763a2c50284dc1b2cd8dfe3654a61f.pdf?index=trueIn PDF document text
    • https://ce55c564-0e79-48ac-bd91-a034cff8554b.filesusr.com/ugd/bd1fc0_21f9ec7f69794bd98300c99aa4c757b2.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_off00014027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14027 5400 bytes
SHA-256: cfbebf2f254a1aab136a3a80e12672dd828a80e5812535aae1d3edb0e782a197
font_01_sfnt_off0001527f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1527F 10368 bytes
SHA-256: 5f00912387766a1dc2a2770f89abbd94d7f40f5d7760069c9ac6feefd32a5ac2

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