Malicious PDF — malware analysis report

Static analysis result for SHA-256 7544502427c3da77…

MALICIOUS

PDF

79.7 KB Created: 2021-02-22 20:40:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: f9e32bdc11569bb30b40a3cf0534ce94 SHA-1: 5d4ffd377b8cccc3e12197d450963643bd204603 SHA-256: 7544502427c3da777489a1544ec18b2f5325924f622fd5866831495c15f75633
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm or phishing lure. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, hinting at its generation method and potential use in a phishing campaign.

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://jacksth.ru/strik?utm_term=ibm+and+the+holocaust+book+review PDF link annotation
    • https://fetezubusob.weebly.com/uploads/1/3/2/6/132681625/c4a9c366.pdfIn PDF document text
    • http://ilkertr.shop/govubusitagizuvilasodidnzz8f.pdfIn PDF document text
    • https://bukenazupe.weebly.com/uploads/1/3/4/5/134584610/8563748.pdfIn PDF document text
    • http://scotiaenlineape-personas.com/sample_projected_balance_sheet_business_planivyx3.pdfIn PDF document text
    • http://feedbacrnz.space/keniru236ry.pdfIn PDF document text
    • http://the-job.ru/growtopia_free_download_ioste6uk.pdfIn PDF document text
    • http://triple-doska6.club/jexurojosigu522z6.pdfIn PDF document text
    • http://vitrinachel.ru/64314137638q9c5r.pdfIn PDF document text
    • http://national-verifyteam.com/suzasnsk6z.pdfIn PDF document text
    • http://rimka.xyz/yoda_hot_air_balloon_meme_templateazwlz.pdfIn PDF document text
    • https://cdn.sqhk.co/wijelukifap/gIDMeeU/death_invasion_survival_game_mod_apk.pdfIn PDF document text
    • http://jumbochecker.com/paris_texas_zoning_mapuy840.pdfIn PDF document text
    • https://rajuvafawomok.weebly.com/uploads/1/3/4/4/134455823/zufurugop_vaxajikifo.pdfIn PDF document text
    • https://cdn.sqhk.co/nebemina/ge1Ojdi/pububitosaxidomegetutad.pdfIn PDF document text
    • http://tamakar.xyz/in_ice_cold_blood_episode_guidet0ime.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/vitelitubovuluj/scientific_term_for_coliform.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/82794008193.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_off0000ed99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED99 5352 bytes
SHA-256: 15ca56218caddfcbcf4b8e200b6cb9d47034f293d6ce4424e61d94a85f0f2b2a
font_01_sfnt_off0000ff9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9B 10368 bytes
SHA-256: 23e90993dc976f873e8f727049215d0648f5890dd18a9003a004414e78459a68
font_02_sfnt_off00012333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12333 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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