Malicious PDF — malware analysis report

Static analysis result for SHA-256 37456ded5af9fb1a…

MALICIOUS

PDF

81.7 KB Created: 2021-02-21 16:46:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 8bf82586b02d72763b8bd157893601fa SHA-1: 31b0491852a420ba5969193844364bce976d599b SHA-256: 37456ded5af9fb1a6d143d61d7e4cb0fc799c0cc3446dc16623ccca35642c398
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or link farms, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or malware distribution.

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://baarspo.ru/strik?utm_term=is+gta+5+playable+on+ps5 PDF link annotation
    • http://sallles.ru/applied_mathematics_3_hari_arorapqv41.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzevawu/nhapRji/zombs_royale_loadout.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/TQ7jgjc/poruzofapibudafevo.pdfIn PDF document text
    • http://dasiroxejipi.22web.org/regulaciones_aduana_cuba.pdfIn PDF document text
    • https://cdn.sqhk.co/kewesowovim/ahbnjdz/60923970713.pdfIn PDF document text
    • https://cdn.sqhk.co/gegefemorosu/hiPhbwF/iota_carrageenan_safety.pdfIn PDF document text
    • http://astrohelp.space/2000_chevy_blazer_service_manuallxtpm.pdfIn PDF document text
    • http://optarfes.com/home_office_guide_preventing_illegal_working1rwus.pdfIn PDF document text
    • https://cdn.sqhk.co/jozanafe/Kmgc6he/snake_vs_block_unblocked_games.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://borarujedumamut.epizy.com/bahubali_2_song_mr_jatt.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/blue_background_images_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/birthday_banner_photoshop_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/chinese_calligraphy_paper.pdfIn PDF document text
    • http://poposumezaxek.rf.gd/46977663276.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/nosoju.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/17985922666.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/kahoot_answer_finder.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7F 5196 bytes
SHA-256: deb6b003f382f1c701a0d852e6db69153822db0094443fbf5ec6148c6e22ff60
font_01_sfnt_off0000fc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4A 12256 bytes
SHA-256: eb79acff5ad0334a3e2191b3b06a4bf75fa3c624d489683ec1eb52640cc1cf07
font_02_sfnt_off00012440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12440 16192 bytes
SHA-256: c903727d1fc1f6ae1b889c39bd613d30596c696eaa42e1410baf014942e292ec

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