Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbed1904f3d1437d…

MALICIOUS

PDF

80.5 KB Created: 2021-01-11 16:05:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 24612a01771aac484d4b107983604ab6 SHA-1: 05b2ac9804a4f2cebe93ca743b59caccb549b7ac SHA-256: cbed1904f3d1437d48235f685dd9e6ba1ece14f2a6bc3753c22157b13ee8f8df
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, with several pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the use of such tactics. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it might be a generated document used as a lure.

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://traffset.ru/123?utm_term=the+fun+they+had+pdf+class+9 PDF link annotation
    • https://solusolifodijal.weebly.com/uploads/1/3/4/4/134433047/933273.pdfIn PDF document text
    • https://site-1177068.mozfiles.com/files/1177068/43864096541.pdfIn PDF document text
    • https://site-1168102.mozfiles.com/files/1168102/spartan_runner_gold_shotgun.pdfIn PDF document text
    • https://cdn.sqhk.co/fosojatesog/Agjjahh/41551921989.pdfIn PDF document text
    • https://site-1166084.mozfiles.com/files/1166084/menerufamezupowuxurutoz.pdfIn PDF document text
    • https://site-1173632.mozfiles.com/files/1173632/23661597766.pdfIn PDF document text
    • https://cdn.sqhk.co/kefesizo/cljhVih/mancala_online_free.pdfIn PDF document text
    • https://sidafixeruj.weebly.com/uploads/1/3/2/6/132681612/4407671.pdfIn PDF document text
    • https://site-1177591.mozfiles.com/files/1177591/what_does_invaluable_mean_in_a_sentence.pdfIn PDF document text
    • https://tisatazufewuvo.weebly.com/uploads/1/3/1/1/131163687/ba81ee4c96405c.pdfIn PDF document text
    • https://site-1173424.mozfiles.com/files/1173424/2181739915.pdfIn PDF document text
    • https://site-1168108.mozfiles.com/files/1168108/chatham_kent_state_of_emergency_march_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zugutixe/70068125270.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/present_tense_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/cambridge_celta_course.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/85122700852.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF106 5076 bytes
SHA-256: aa65ae1de5668357b1f0dfb8e2a966877ffb179776d5d07e63e6808697698e29
font_01_sfnt_off00010246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10246 10592 bytes
SHA-256: 97fc3639bf28039e68fbae28b8be387e4557e803d397fcbf68d3691881ce5e6c
font_02_sfnt_off0001268e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268E 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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