Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aac7d62b155f331…

MALICIOUS

PDF

73.0 KB Created: 2021-03-01 02:47:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: c0cc6f36b89748f08ceb2a672a4c05c5 SHA-1: 0da4da5c4084ec7a0670b145af02b50e055d1634 SHA-256: 1aac7d62b155f331b943f28899a8bbd1870937c4c18b0b52596674cb9abfab8a
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, as malicious and phishing-related. It contains numerous embedded URLs, with one prominent URL pointing to a site that appears to be a link farm designed to redirect users to potentially malicious content. The document body, though partially corrupted, suggests a lure related to free books, which is a common tactic for phishing and malware distribution.

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://seumenha.ru/strik?utm_term=western+romance+books+to+read+online+for+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375696/normal_5fcc3be98e0c4.pdfIn PDF document text
    • http://pojorabe.iblogger.org/66418978272.pdfIn PDF document text
    • https://cdn.sqhk.co/zonakagud/TZgigom/dapimikikometa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485173/normal_5fcafa39f2509.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451752/normal_5fd2a814aad90.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/ijf7gdB/how_to_rat_proof_my_chicken_run.pdfIn PDF document text
    • https://xunujilitaga.weebly.com/uploads/1/3/5/3/135315779/dbbb9fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485310/normal_5fe286653b1f9.pdfIn PDF document text
    • https://cdn.sqhk.co/wamiratena/uigNWjc/piseniwogukoxatikojamiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://janizopug.epizy.com/bengali_to_english_calendar.pdfIn PDF document text
    • http://suredutika.rf.gd/lodawa.pdfIn PDF document text
    • http://fibotemirazopo.rf.gd/pizawewelinepeka.pdfIn PDF document text
    • http://dazotetitow.epizy.com/naletidokebogekel.pdfIn PDF document text
    • http://wowulikuvej.rf.gd/bruce_lee_songs_download_320kbps_atozmp3.pdfIn PDF document text
    • http://lopaxoreje.rf.gd/types_of_paper_airplanes.pdfIn PDF document text
    • http://naxixexofeveto.epizy.com/maths_puzzles_for_class_7_with_answers.pdfIn PDF document text
    • http://zepibugab.rf.gd/gufifirujipupagotilaba.pdfIn PDF document text
    • http://lozisuvuxinosog.epizy.com/42637050549.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_off0000e1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D4 5384 bytes
SHA-256: 14e98da8190a0e3db4e98932cd10c57eb740c55b5d02fa0f13cb99eada15de0b
font_01_sfnt_off0000f416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF416 10192 bytes
SHA-256: 423082263af6003277fa6ab49c3f60909f8f5f28a7c8e76ecfd25f7cde725b54

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