Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bb5941137219047…

MALICIOUS

PDF

71.8 KB Created: 2021-02-13 11:33:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9647b5aa8185484c0feb2da04f77c371 SHA-1: e446cf0391e98f79d1a380133a449fa1b6c87add SHA-256: 0bb5941137219047b70a7f84ec5a1db61c5f37147113a7973da61aae66157da8
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 domains or link farms, indicating a phishing or traffic-driving scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or credential harvesting. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=simply+keto+pdf+espa%25C3%25B1ol PDF link annotation
    • https://cdn.sqhk.co/jirowolad/vghhh8Q/ximinovola.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/cliegcP/lokatazunup.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/S4UsGak/87472568094.pdfIn PDF document text
    • http://samyog.ru/bluford_booksdcv3p.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/cggIibG/82859219090.pdfIn PDF document text
    • https://cdn.sqhk.co/jupozaregu/dqLeA0R/premium_midsole_paint_pen_white.pdfIn PDF document text
    • https://cdn.sqhk.co/lotivadafe/eMjiIne/kelobojirofazu.pdfIn PDF document text
    • http://mnogoturov.com/223127117780rq9.pdfIn PDF document text
    • https://cdn.sqhk.co/sirepajaku/tw2icUI/download_game_real_piano_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/fckTghC/ballsy_definition_synonym.pdfIn PDF document text
    • https://cdn.sqhk.co/rufopunuk/agj9Oib/wizewelukusejezisukok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tobobowu/baileigh_drill_press_dp-_1000g_manual.pdfIn PDF document text
    • http://zigazus.rf.gd/cheetah_keyboard_review_android.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/mejuwutonafuno.pdfIn PDF document text
    • http://siletafelit.epizy.com/pedelasedowowosilewamivov.pdfIn PDF document text
    • http://buwumipulufi.epizy.com/nofebisijoliperelajosexeb.pdfIn PDF document text
    • http://lisotabisalak.epizy.com/45170198233.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_off0000d9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E2 5572 bytes
SHA-256: 7f3583260100d7fb45032d24195f23b1bfda3f1c0f49b3ab30213e9d44e94525
font_01_sfnt_off0000ec91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC91 10420 bytes
SHA-256: 3610fed4edb5f8531027cf26c1ab1279068b18b90fb54ca6115c93339df874f4

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