Malicious PDF — malware analysis report

Static analysis result for SHA-256 9735a4ec3a17cb53…

MALICIOUS

PDF

71.1 KB Created: 2021-02-11 16:09:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 16be985cc1fc2e2bb185aa3251842673 SHA-1: 2f5ffb74810e256c012e8cd8f2d0e4bd89911282 SHA-256: 9735a4ec3a17cb53a7e592607c4b3be3fa7e17d85471c250c0a5413b7e6aa5e3
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a high-confidence heuristic indicating it's a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to a phishing or malware download site. The document body, though heavily obfuscated, contains text fragments related to 'Cables in networking pdf' and 'wkhtmltopdf', suggesting a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/aws?utm_term=cables+in+networking+pdf PDF link annotation
    • http://vizit.store/zaboboxibudaxemag8xq69.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/ghcgcr5/snap_assist_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/395iije/edjing_mix_dj_music_mixer_pc_download.pdfIn PDF document text
    • https://cdn.sqhk.co/devurekon/nQhjmje/58726875275.pdfIn PDF document text
    • https://cdn.sqhk.co/bodavadu/ssHXBjf/pet_rescue_saga_download_windows_7.pdfIn PDF document text
    • https://cdn.sqhk.co/vagizabibo/yeghZnE/wevamavesogugipegiluzozum.pdfIn PDF document text
    • https://cdn.sqhk.co/bimafaboxugu/gyZifge/hicare_app_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/ropobemuma/2jJjajf/nasowesevojo.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/jihjahh/bass_pro_shop_hours_las_vegas.pdfIn PDF document text
    • http://smeh-mif.space/mejimiwenarikivukuxika1qwq4.pdfIn PDF document text
    • http://ductsunlimitedins.com/sunepdfyer.pdfIn PDF document text
    • https://cdn.sqhk.co/definuseju/jfiehez/zukuxejuvikolopiguxaguvi.pdfIn PDF document text
    • https://cdn.sqhk.co/pipujevi/jejjkOu/best_voice_changer_free_download.pdfIn PDF document text
    • http://bajelow.iblogger.org/amedspor_deplasman_formas.pdfIn PDF document text
    • http://kersita.fun/sukoxufafez6im9r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://topawod.epizy.com/togagumu.pdfIn PDF document text
    • http://mumupaju.epizy.com/cuneiform_foot_anatomy.pdfIn PDF document text
    • http://residarifuwus.rf.gd/55248225495.pdfIn PDF document text
    • http://melurijaniloxa.rf.gd/printable_amsterdam_map.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_off0000d74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74F 5412 bytes
SHA-256: b64362f26c6c650cbf0631bacf597b3d420dfcd70c0885ea3388ab01b350a059
font_01_sfnt_off0000e9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CF 10868 bytes
SHA-256: ba2ec9f9ee39910a99d98d656a2679497bdc4d71c407fd35ded8e147aaf730ed

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