Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca918effab5b8282…

MALICIOUS

PDF

75.6 KB Created: 2021-03-29 00:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 1cfeac70c043429b25c696b515799acb SHA-1: cab483300c8bda4d494c17fd99dc143054c8fa3d SHA-256: ca918effab5b82824bda7a65b9e03f8b5a550dab2addb84ca1a6ead143361175
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 critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains or link farms, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, appears to be a lure related to business books, aiming to trick users into clicking malicious links.

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://bologen.ru/award?keyword=best+business+startup+books+pdf PDF link annotation
    • https://cdn.sqhk.co/dujujema/1hbBDgh/rigetexarimigofuzet.pdfIn PDF document text
    • http://sushibara.net/648321588898tjpi.pdfIn PDF document text
    • http://naligixe.getenjoyment.net/vopegenapelavesezoze.pdfIn PDF document text
    • http://jujovobima.getenjoyment.net/meaning_of_absenteeism.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/jegeihG/10930271956.pdfIn PDF document text
    • http://insurancecarusa.com/368189115856ww4a.pdfIn PDF document text
    • https://cdn.sqhk.co/fizuborugas/a0hbvvr/pathfinder_no_pen_no_paperwork.pdfIn PDF document text
    • http://zibikudupe.mywebcommunity.org/weber_spirit_e-210_side_burner.pdfIn PDF document text
    • http://vorecan.fun/688975392474cjrm.pdfIn PDF document text
    • https://cdn.sqhk.co/dilizilozok/e6AFkhd/satozoz.pdfIn PDF document text
    • http://tuxesimufimiti.mypressonline.com/wekawibi.pdfIn PDF document text
    • http://brumbum6.xyz/altec_lansing_mini_lifejacket_jolt_with_lightslbfvx.pdfIn PDF document text
    • http://nyvelsets.online/the_masque_of_the_red_death_symbolism_prince_prospero0ih81.pdfIn PDF document text
    • http://liketime.fun/zosodoselaj3zkfw.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/nefomojuwet/pufipowixawupoxemu.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/papupizimafugise.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_off0000eae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE0 5256 bytes
SHA-256: b8a0f4c68a82c09731c6b523c4fab426ec91e41e9f3f42e7868bb5546691c03b
font_01_sfnt_off0000fccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCD 10968 bytes
SHA-256: 890d040659d390c4eb3e36252ab5a249baf795b792eeb81280b05f241ff53c27

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