Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aed15502c0f0cf7…

MALICIOUS

PDF

73.4 KB Created: 2021-04-03 08:40:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b651ad609688b7b4bc134401635be012 SHA-1: 46af15724743c4557b4b41d2247a07f0b83ed28a SHA-256: 0aed15502c0f0cf76b6bb30a20262a45677701188626a355e6ddd1b979928efa
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure for a book download, which is a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://druttle.ru/award?keyword=flowers+for+algernon+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/kuwusemob/CtgeAkE/xujugu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417419/normal_5fe8c1ba70425.pdfIn PDF document text
    • http://good-production20.site/dresden_files_wiki_mollydfyff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453142/normal_5ff4236c05172.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/0iaiahb/amazon_prime_video_subscription_cancel.pdfIn PDF document text
    • http://clubstore.pro/bufudarosozuss7j11.pdfIn PDF document text
    • http://larts.digital/minogapiglra65.pdfIn PDF document text
    • https://cdn.sqhk.co/miraroki/giEjejf/60756621067.pdfIn PDF document text
    • http://rating-bookmaker.ru/lonodogujexigoginamuxatupb74v.pdfIn PDF document text
    • http://babysampler.com/vegimebas1v3cg.pdfIn PDF document text
    • http://cheapkeys.site/mp3_pocket_rocket_free_downloadzlqmm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453754/normal_5fc8dd70a4419.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/higiSge/strength_training_workout_for_beginners.pdfIn PDF document text
    • http://idealica-tufficiale.website/risazowikeridorojepag39dzh.pdfIn PDF document text
    • http://sq11mini.com/ge_water_softener_owners_manual4ip35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427783/normal_6056abbd5b9f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427501/normal_60364c40a1de6.pdfIn PDF document text
    • https://cdn.sqhk.co/towafeniruje/IJidDlM/guforuperasez.pdfIn PDF document text
    • http://soldatskaya6.ru/mini_elm327_obd2_ii_bluetooth_reviewf7kbk.pdfIn PDF document text
    • http://clientbluebadge.com/latin_and_greek_roots_challenge_answerschgug.pdfIn PDF document text
    • http://worldthailand.fun/breeding_netherland_dwarf_rabbits_colorapydt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_017efda2073d4f0b97dfbcb4867bea57.pdf?index=trueIn PDF document text
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_77ef9f9766e849ecb1114dd4497b6763.pdf?index=trueIn 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_off0000ddaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAA 5256 bytes
SHA-256: 920ca05403dd1850a076c3aec30f18e664d1560b638ee6a0bdec40579171609e
font_01_sfnt_off0000efb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB0 11580 bytes
SHA-256: e7c4a58a344e5fa3ab1e6fec22dd8f39b7bcf4db3fb0ee5f3b442b274d5bb43a

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