Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8438a0f7398d30e…

MALICIOUS

PDF

76.6 KB Created: 2021-02-16 18:16:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f2ab0574ec8081264528b0c0a272e56c SHA-1: ae367661e3f59687eaa62474eaee737facd5022b SHA-256: d8438a0f7398d30e0746df50b98d55345cfdc149f97de551ace8d6468622c5af
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document delivery, often associated with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=confessions+of+a+shopaholic+movie+quotes PDF link annotation
    • https://cdn.sqhk.co/vaminika/gfjabYa/gutschein_bei_amazon_prime_einlosen.pdfIn PDF document text
    • http://istra-backwater.ru/cavernous_malformation_of_the_brainstem0yyh1.pdfIn PDF document text
    • https://cdn.sqhk.co/duwutawuna/ifCFAp5/kiwosovis.pdfIn PDF document text
    • http://look-hotel.com/800877570526eb3c.pdfIn PDF document text
    • http://copyrightshelpscenters.com/cali_move1x7hg.pdfIn PDF document text
    • http://mysteps.online/87780073007x9mm7.pdfIn PDF document text
    • https://cdn.sqhk.co/datolabevev/KhfojeW/hand_simulator_survival_vr.pdfIn PDF document text
    • http://mangalvpodarok.ru/452268580118c7r2.pdfIn PDF document text
    • http://blacktea.space/peden1hswd.pdfIn PDF document text
    • https://faxezufag.weebly.com/uploads/1/3/0/8/130874059/31957b.pdfIn PDF document text
    • https://cdn.sqhk.co/pemejurove/9Vhfidw/scary_teacher_3d_chapter_2_apk_download.pdfIn PDF document text
    • http://ottics.ru/toy_phone_sensory_apps_for_babies_and_toddlersas5vt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/degagaziv/challenge_bhojpuri_movie_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/angry_birds_rio_1._0_0_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/balancing_equations_chemical_reactions_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/rental_agreement_template_indiana.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_off0000f14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14F 5248 bytes
SHA-256: 2095cd8527b3eb64648f858cf1196155b865fbc2f80943cc23e67317049fe0c6
font_01_sfnt_off0001031a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031A 10088 bytes
SHA-256: 610fa8598523459d55ee2989be142e77bf6d5ebcbf57a2589790d76b0bf757df

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