Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd94b34b2308b7fd…

MALICIOUS

PDF

78.1 KB Created: 2021-02-26 15:54:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: b706f29d68de61e6d8a79e7322a929e4 SHA-1: 4c1251602a4f6eedaf10467260cc0626280c2e5e SHA-256: dd94b34b2308b7fdcdd0c057efa6f9d2a9da227b464e6b5402905a05cb90552d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, directing users to multiple external URLs, some of which are hosted on disposable domains. The presence of numerous PDF files on these domains suggests a potential SEO manipulation or content distribution scheme. No scripts were extracted, but the overall structure points to a phishing or spamming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/award?keyword=room+divider+bookshelf+system PDF link annotation
    • http://osthondroz.com/checkbook_balance_form6wjzy.pdfIn PDF document text
    • http://abwaab.su/56109087574r3fes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377706/normal_6024770790041.pdfIn PDF document text
    • http://tajoraf.22web.org/44721035583.pdfIn PDF document text
    • http://vzruvayarttraff.xyz/adobe_photoshop_cs_8.0894kx.pdfIn PDF document text
    • https://cdn.sqhk.co/dogilijesiwu/hbGZAgh/under_a_spell_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/jawuraxexije/ffig4jl/rainbow_rare_pokemon_card_charizard.pdfIn PDF document text
    • http://form-lnstagramcopyrightservices.com/vubaga3687g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414864/normal_5fd1af60827b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501233/normal_5fe3ea8adb460.pdfIn PDF document text
    • https://cdn.sqhk.co/zatuwifezub/ibjfU5G/nejenetud.pdfIn PDF document text
    • https://cdn.sqhk.co/lasijutag/bUfU1hj/sims_4_superhero_mods_2019_clothes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gosaduzunake.myartsonline.com/winojerufar.pdfIn PDF document text
    • http://kugilib.rf.gd/installation_cable_guide_automower.pdfIn PDF document text
    • http://direpedokelazal.rf.gd/submit_button_outside_form_react.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_off0000f2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DC 5308 bytes
SHA-256: 68548464d14f8748e6388d3cbcf3726e4717174d4aadf1c90f3e00c06e9ede18
font_01_sfnt_off000104d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D5 11808 bytes
SHA-256: 79a11199aac8805df697b1da01f35e413f609a2fbacfbbb204b96c363521fcea

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