Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bdba532fabe199e…

MALICIOUS

PDF

75.9 KB Created: 2021-04-07 11:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 25b875872ab0cd879ed52f5e43c3be7a SHA-1: 96234cb2b2c634aa107c250f2edbb9ea4eede224 SHA-256: 8bdba532fabe199e85fe47110b34072fc7b403dab5be4e261ebc026f0137f816
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ClamAV and an ML classifier, and contains numerous external URIs, many of which point to disposable hosting. The document body, though heavily obfuscated, suggests a lure related to 'printable vocabulary worksheets grade 9'. The presence of external links and the nature of the heuristics strongly indicate that this document is designed to redirect the user to a malicious site, likely to download a second-stage payload. No scripts were extracted, but the overall behavior aligns with a phishing or malware distribution scheme.

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://fokemale.ru/strik?utm_term=printable+vocabulary+worksheets+grade+9 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368469/normal_604145b69f4a5.pdfIn PDF document text
    • https://poxawakepuk.weebly.com/uploads/1/3/1/6/131606289/ximob.pdfIn PDF document text
    • http://shop-kid-toys.online/photoshop_tutorial_photo_manipulation_change_background__blending_tj2bc0s.pdfIn PDF document text
    • http://fortuneo-enligne.com/90453780014lb2zz.pdfIn PDF document text
    • http://on24-system.club/guitar_lessons_book_freekv1p9.pdfIn PDF document text
    • http://losinglotterynumbers.com/24933610335svmtu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464709/normal_60170cd7edc63.pdfIn PDF document text
    • https://xomivumikeso.weebly.com/uploads/1/3/0/7/130774979/darobepig-kizesip-foxalofeluk.pdfIn PDF document text
    • https://wigikeketiru.weebly.com/uploads/1/3/1/4/131406435/xiwuk_zusik_mefugubulazigot.pdfIn PDF document text
    • https://cdn.sqhk.co/dafisuwikib/jegigcG/best_buy_south_austin_hours.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417815/normal_600e791348f45.pdfIn PDF document text
    • https://nijodumedogale.weebly.com/uploads/1/3/6/0/136082157/7708434.pdfIn PDF document text
    • https://cdn.sqhk.co/nutewakizi/hdagji4/wd_my_cloud_hard_drive_failure.pdfIn PDF document text
    • http://dombitarf.ru/belkin_n750_db_router_manuallhzoz.pdfIn PDF document text
    • https://belawutuvuzepim.weebly.com/uploads/1/3/4/6/134605506/7128548.pdfIn PDF document text
    • https://cdn.sqhk.co/wusezofetib/AhbgtUd/bike_race_all_bikes_unlocked_apk_free_download.pdfIn PDF document text
    • https://wejolizamu.weebly.com/uploads/1/3/4/7/134766198/moninu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408195/normal_6008ce07b465e.pdfIn PDF document text
    • http://megantv.site/bonalofesigezyau9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D7 5816 bytes
SHA-256: 6293060ca1374c651930817122270175ab58a99460976f32b173650a2b7c63ee
font_01_sfnt_off0000fbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAD 11164 bytes
SHA-256: 80165f2db15773b56a912d48f0e80c9f0841a2ec7bbf7d9cafc2987e95a706a3

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