Malicious PDF — malware analysis report

Static analysis result for SHA-256 820a1698e991183a…

MALICIOUS

PDF

69.8 KB Created: 2021-03-28 20:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 12b3925c626f05c60d02994ea84f36ce SHA-1: e4fd267c945c48e55933b6aff0840a35f6525561 SHA-256: 820a1698e991183a60800d0cdce9360792f9115025d46a4fbb66b74891b28044
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and embedded URLs, with several pointing to disposable hosting and potentially malicious domains, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to PDF creation, but no direct textual lure is discernible.

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://zajinet.ru/award?keyword=normal+and+anomalous+dispersion+pdf PDF link annotation
    • http://vitodibiwanezej.mypressonline.com/albahaca_planta_medicinal.pdfIn PDF document text
    • http://potuxoposutu.medianewsonline.com/kegumevexanosaradexaruv.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/does_alexa_work_with_roku_express.pdfIn PDF document text
    • http://twitter-center.com/kumon_math_books_grade_31ggt1.pdfIn PDF document text
    • http://xivazokib.medianewsonline.com/jofuzepoxeg.pdfIn PDF document text
    • http://masajsalonunuz.com/cable_reseau_player_freeboxmznp4.pdfIn PDF document text
    • http://begimewabifax.getenjoyment.net/cardinal_numbers_1_1000.pdfIn PDF document text
    • http://fejukoturig.medianewsonline.com/32550694354.pdfIn PDF document text
    • http://fotubobuwenapu.scienceontheweb.net/62729048630.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/nifoneva.pdfIn PDF document text
    • http://nutosuvitiraj.scienceontheweb.net/samuel_beckett_bridge_rotation.pdfIn PDF document text
    • http://jozipuvuwuzaj.mywebcommunity.org/arithmetic_reasoning.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xemunebo.atwebpages.com/26809297396.pdfIn PDF document text
    • http://pavafisufopu.myartsonline.com/remax_brand_identity_2020.pdfIn PDF document text
    • https://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_17d0acceb05048c09e19dce05e12e537.pdf?index=trueIn PDF document text
    • https://5b949be5-44ef-49af-96c7-0ebaa8fe632e.filesusr.com/ugd/3402b1_e8d61a3aa2484d9395982edcee1adce2.pdf?index=trueIn PDF document text
    • http://kagijido.myartsonline.com/geometrical_isomerism_mcq.pdfIn PDF document text
    • http://fojosotum.myartsonline.com/samsung_rf267_manual_defrost.pdfIn PDF document text
    • http://fojosotum.myartsonline.com/6632103153.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_off0000d44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44D 5156 bytes
SHA-256: c1939b3c760eab843836704a2db7d5e2ee8f05a789f4e45de5b0e39292bd1acd
font_01_sfnt_off0000e5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BE 10536 bytes
SHA-256: 04446371aec05de403aa6b0fd4ef4d033f5fcd5d73d2355c3e4b24288d6826fe

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