Malicious PDF — malware analysis report

Static analysis result for SHA-256 88aadc2e31c976b2…

MALICIOUS

PDF

82.4 KB Created: 2021-02-23 22:37:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 02e8b6409e17c072a507f7c8b9bc7f3f SHA-1: 9292616dcd19a818a5616c2b430c5e07b31bd309 SHA-256: 88aadc2e31c976b2aa21f6ef54f8557e38659aaf3864ca1694fb693bfd2216d6
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The document body, though heavily obfuscated, suggests a lure related to 'Stephen King horror movies list', which is likely a pretext to drive traffic to the malicious URLs.

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://seumenha.ru/aws?utm_term=stephen+king+horror+movies+list PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411229/normal_60146ed720cb6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365628/normal_5ff66a61ea412.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367667/normal_5fd647c0e6acf.pdfIn PDF document text
    • http://vrestoran.info/ableton_live_10_pccmzah.pdfIn PDF document text
    • http://options.expert/score_hero_hack_mod_apk_2019htwqd.pdfIn PDF document text
    • http://study-english-05.site/the_natural_dog_company_tremenda_chewy_bullsmkx7y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409992/normal_6020a9af18e93.pdfIn PDF document text
    • https://cdn.sqhk.co/womibakok/AjjhiPT/disney_princess_dress_up_outfits_games.pdfIn PDF document text
    • http://help-nanny.site/medial_sound_worksheets_for_grade_1bzobj.pdfIn PDF document text
    • http://kaxidabifibag.iblogger.org/microsoft_ergonomic_keyboard_400_manual.pdfIn PDF document text
    • http://desenusexewu.iblogger.org/dipubokogokazuvusofiraj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451205/normal_60074fd9878f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gejujebiwibi.epizy.com/45546411484.pdfIn PDF document text
    • http://fejiremow.epizy.com/gakovegabasab.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_off00010378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10378 5248 bytes
SHA-256: 3df503c457c54065cf75709e68eff2d68fd75e132b91bbb87b0ad02fb43d388e
font_01_sfnt_off00011533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11533 11120 bytes
SHA-256: 93f3b32a74f17b3628042e821f933082a6b783860f97a325378a7750fbf60a64

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