Malicious PDF — malware analysis report

Static analysis result for SHA-256 151f0d520cb747cc…

MALICIOUS

PDF

74.5 KB Created: 2021-04-01 23:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 460c2e00f2d683967eb9448ef92a2541 SHA-1: cf4dc96e9e3b5639dc58d5327d4b37d707da3538 SHA-256: 151f0d520cb747cc9657bc4f4e2a1493b546d1c4a17b379d4160cd5515b692ff
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to disposable domains and are likely used to host malicious content or redirect users to phishing sites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a specific book title, suggesting a lure to disguise the malicious intent. No scripts were extracted, but the PDF structure itself facilitates the redirection to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://maypoin.ru/award?keyword=anita+desai+cry+the+peacock+pdf PDF link annotation
    • http://fruitik.space/semi_block_style_application_letter_formatpms24.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://belkwigs.com/29648140671s7qus.pdfIn PDF document text
    • http://help-lnstagramcopyrights-verify.com/p6x58d-e_bios_mod7kcyh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487626/normal_6059b5946fd99.pdfIn PDF document text
    • http://repaircreditscore.info/troy_bilt_pressure_washer_hose_fittings9ildt.pdfIn PDF document text
    • http://cleaner360.shop/flotec_pump_parts_home_depot50gar.pdfIn PDF document text
    • http://milanbeachs.space/46323009247o81wt.pdfIn PDF document text
    • http://bred-enligne.com/11044203674pap9r.pdfIn PDF document text
    • http://ogranicbio.fun/what_happened_in_the_greek_golden_agekymbh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384652/normal_5fff693aa8c67.pdfIn PDF document text
    • http://trenketo.buzz/pivirerosepewuboxalwxxl1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475859/normal_601baa4f44dd7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464313/normal_60021ed94f6a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502500/normal_6035dd5fac8e7.pdfIn PDF document text
    • http://onlinesos.tech/ronald_dworkin_laws_empireqdvzd.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/zebarufuridorur/27797784863.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/how_to_make_a_rangers_apprentice_cloak.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_off0000e638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE638 5368 bytes
SHA-256: 3b24a7f327dabbc6cc3a653d59e6347dddafcafe22cad814365758a57c4bfa68
font_01_sfnt_off0000f87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87F 10760 bytes
SHA-256: 56243e8512467324a78938e1fb9cfae4840b4d5d6b5f9abaefb1c763ef9f60da

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