Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc6909cf374226c9…

MALICIOUS

PDF

99.5 KB Created: 2021-03-03 07:32:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 589b4bc1e00923d2cf133db59d38ec06 SHA-1: 04f5a7eee4b62e097e321921e5c860db51b884fa SHA-256: dc6909cf374226c9c3f1a675f3993f9e08d1b4ff8e6142dbbd31affe2d1bdfe4
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating the PDF's primary function is to redirect users to potentially harmful external content.

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://vilenefex.ru/123?utm_term=braun+series+7+replacement+head+reset PDF link annotation
    • https://cdn.sqhk.co/pibegufuxova/iiY1uhe/mobile_strike_pack_loading_software.pdfIn PDF document text
    • http://crubr.space/78377729817u7yc.pdfIn PDF document text
    • http://boevoenlp.com/cxc_biology_past_papers6b62f.pdfIn PDF document text
    • http://tomogorman.com/automotive_mechanics_basicsdwcqs.pdfIn PDF document text
    • http://datingdate.site/misipekiwilifigar6sln8.pdfIn PDF document text
    • https://nopiviwefimak.weebly.com/uploads/1/3/4/7/134708781/2360340.pdfIn PDF document text
    • https://cdn.sqhk.co/lamiwifa/hbhdmij/shark_life_animal_simulator_apk.pdfIn PDF document text
    • http://big-ita.space/advancement_of_learningoep98.pdfIn PDF document text
    • http://revershjtb.site/swapna_varahi_mantra_in_teluguxq8vl.pdfIn PDF document text
    • http://help-feedback-amzn8.xyz/las_flores_del_mal_poema_de_charles_baudelairehrk33.pdfIn PDF document text
    • http://sayseedokg.com/49063743458hkjo2.pdfIn PDF document text
    • http://floradoma.net/great_gatsby_vocabulary_chapter_2yt73q.pdfIn PDF document text
    • https://zunukewonodej.weebly.com/uploads/1/3/1/4/131453615/3431365.pdfIn PDF document text
    • https://cdn.sqhk.co/dufolatik/ijEfJAx/19955156761.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzabajixiw/HS0jbeB/farkle_dice_game_online_free.pdfIn PDF document text
    • https://vubufogos.weebly.com/uploads/1/3/4/7/134766152/498584.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mawafomixo.rf.gd/33127287261.pdfIn PDF document text
    • http://disetorabagubed.epizy.com/79184133572.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_off000148c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C3 5444 bytes
SHA-256: 4bcc824071b7689931dce769fcb905661911954c334f322b8562e5e10c396708
font_01_sfnt_off00015b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B19 10988 bytes
SHA-256: 1bf765abd43e4fc95ca1a1e5e7d2aa76f286bfa1203d1fc364ad6f0526977027

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