Malicious PDF — malware analysis report

Static analysis result for SHA-256 157f014bff8bfeca…

MALICIOUS

PDF

68.8 KB Created: 2021-01-13 13:35:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 4c8e674845030bf0a3c86776ad2df2f0 SHA-1: dd51d533192eaa41c3c847935cb9cee800db5215 SHA-256: 157f014bff8bfecae2e60dd3201eb8c119b255c3c36d135eae78082657973c8e
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which are designed to appear as legitimate content like wallpapers or film songs, but ultimately redirect to malicious infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags the URL https://cctraff.ru/aws?utm_term=apoorvaragam+malayalam+film+songs as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/aws?utm_term=apoorvaragam+malayalam+film+songs In PDF document text
    • https://site-1180637.mozfiles.com/files/1180637/mujoj.pdfIn PDF document text
    • https://site-1175847.mozfiles.com/files/1175847/49954034220.pdfIn PDF document text
    • https://site-1194674.mozfiles.com/files/1194674/best_superhero_wallpaper_hd_for_pc.pdfIn PDF document text
    • https://site-1166656.mozfiles.com/files/1166656/rififufejomukep.pdfIn PDF document text
    • https://site-1246207.mozfiles.com/files/1246207/whirlpool_dishwasher_wdta50sahz_owners_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478928/normal_5ff25a01712d4.pdfIn PDF document text
    • https://site-1180826.mozfiles.com/files/1180826/jenaruximonokuguvibavum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368504/normal_5f88b4c7e8752.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374688/normal_5f8abaa562896.pdfIn PDF document text
    • https://site-1166749.mozfiles.com/files/1166749/super_car_racing_multiplayer_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/busosuwik/QeiiidA/company_of_heroes_3_trailer.pdfIn PDF document text
    • https://xovirekines.weebly.com/uploads/1/3/4/6/134648888/7256558.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_off0000cd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD93 5372 bytes
SHA-256: 97db7bf37a41576ba4c44500115ebcd26b5ebb239d61890a4c6f0f1244f5378a
font_01_sfnt_off0000dfda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDA 11484 bytes
SHA-256: 61a6c3ffb31f4bd1b9f8130209c94c1f2412e2408954fafcdf4aacf3a03f8d52

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