Malicious PDF — malware analysis report

Static analysis result for SHA-256 505dd939514157cf…

MALICIOUS

PDF

65.9 KB Created: 2021-02-25 12:14:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ab34ef95d2a66c4df0abeb204f254563 SHA-1: 9be3e4b6ebc9bb80a77f5aaa49ab5990e4b6380e SHA-256: 505dd939514157cf2484c0eb6da2544104e71756da012ea5aae7457ff10bbe4b
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=sennheiser+xs+wireless+pairing PDF link annotation
    • https://govotewimodiku.weebly.com/uploads/1/3/4/6/134649218/487339.pdfIn PDF document text
    • https://cdn.sqhk.co/timadupak/jczGkhe/najusuvunapajizawinaxadug.pdfIn PDF document text
    • https://cdn.sqhk.co/dukoredod/dxIijii/toca_hair_salon_me_free_download_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/puxedimuwo/haf14id/70542058406.pdfIn PDF document text
    • https://sewobefavewekog.weebly.com/uploads/1/3/4/3/134367647/tepeser-numukizom-wufulejatur-sazugixab.pdfIn PDF document text
    • https://lanufuxag.weebly.com/uploads/1/3/0/9/130969896/mufako.pdfIn PDF document text
    • https://napajudiweji.weebly.com/uploads/1/3/4/3/134316113/6a1d9e33.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuzigup/ZjdBRdC/blades_of_brim_mod_apk_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/razefudixid/fhbQefV/oklahoma_coronavirus_news.pdfIn PDF document text
    • http://alcozerox.com/poximeliwpi1v8.pdfIn PDF document text
    • https://wadamosemexijep.weebly.com/uploads/1/3/4/4/134434227/diropuba.pdfIn PDF document text
    • https://cdn.sqhk.co/xodakebebit/c7pEFKl/55336023174.pdfIn PDF document text
    • http://motivawka.online/napemixofuvx78jd.pdfIn PDF document text
    • https://cdn.sqhk.co/wugunifikezu/icjingf/gunumibozenisinumije.pdfIn PDF document text
    • http://grizhoff.ru/dragon_kingdom_2020lp17g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC588 5344 bytes
SHA-256: 4fe4c12fdcad9d56a3cb6a9f036b5cddcdc914ab03627af9171da766d911d8da
font_01_sfnt_off0000d7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C5 10404 bytes
SHA-256: 94395b824cef234bd386addd74f7b97b1d3b3d03d95a411323c458ee68192b46

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