Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec81cff8255ee920…

MALICIOUS

PDF

78.8 KB Created: 2021-03-12 08:56:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fcda79dfe7c71a3bbb7c8b86187c2f12 SHA-1: 05ee4eb5a53f03e787ba43a46ccd696fa75abdc1 SHA-256: ec81cff8255ee920080aabc96139843d062cf7ce156d06fb815449705be685f9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver malicious content.

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://xezojetit.ru/123?utm_term=gmat+official+guide+pdf+2015 PDF link annotation
    • https://kevulukopefot.weebly.com/uploads/1/3/1/4/131453006/2586369.pdfIn PDF document text
    • http://lynciguest.com/handbuch_zur_deutschen_grammatik_ansfowvs.pdfIn PDF document text
    • https://cdn.sqhk.co/sujubowip/hbif5Ux/sonic_adventure_dx_director_s_cut_review.pdfIn PDF document text
    • https://cdn.sqhk.co/dedesonor/SicfFja/rudagamusuvutesijipak.pdfIn PDF document text
    • http://epipog.com/how_to_apply_food_safety_officer9vi7v.pdfIn PDF document text
    • https://pemifapizu.weebly.com/uploads/1/3/0/7/130776061/fejonabadiv_juxivu.pdfIn PDF document text
    • http://trendmobile.ru/angry_birds_transformers_qr_codes_cheaty84ok.pdfIn PDF document text
    • http://eushopvmn.site/36514653153iaqd2.pdfIn PDF document text
    • https://bepagiji.weebly.com/uploads/1/3/4/3/134352373/21b913a8e307.pdfIn PDF document text
    • http://kefisel.22web.org/buxajidagab.pdfIn PDF document text
    • http://foyou.store/suzowajudiw53s.pdfIn PDF document text
    • http://fulusixavopowem.iblogger.org/76343710107.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vuzujalaj.epizy.com/why_is_my_xfi_app_not_working.pdfIn PDF document text
    • http://dogamesesokuj.rf.gd/aadhaar_form_filling_example.pdfIn PDF document text
    • http://segigeserife.epizy.com/zofaxipidafadusufamu.pdfIn PDF document text
    • http://wabelat.epizy.com/27110163237.pdfIn PDF document text
    • http://xitexeb.epizy.com/how_to_make_3d_illusion_lamp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03900b94-0fe3-45fa-a82b-011ef2f30265/bayliner_boat_parts_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b649eab-d470-47c0-a7d0-fea305b5439b/the_art_of_racing_in_the_rain_movie_watch_online.pdfIn PDF document text
    • http://duximepameme.epizy.com/resistance_to_beta_lactam_antibiotics.pdfIn PDF document text
    • http://loxugosatutibiv.epizy.com/pujaveguji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26fd23ee-39a9-4513-9beb-9045cb2647f5/how_to_cook_cajun_pasta.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_off0000ec1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1D 5684 bytes
SHA-256: f6526b42245f67adab78c3a0278e8f7fd59d9e740a4879a6d343e38073d1ee79
font_01_sfnt_off0000ff71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF71 14556 bytes
SHA-256: 1a138622623b3a037fa41026ef61efb5039f6acd1aa70fc473e6b81cad85d756

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