Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc2e2ee5d3e4822…

MALICIOUS

PDF

70.4 KB Created: 2021-03-30 01:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: f9fd7431a4aea1f2badefde60406fdc1 SHA-1: 9aeb8a026484e4bc66d6e0ada493c444bf5e57db SHA-256: 3bc2e2ee5d3e48228dfa42c2b84a70b25045786dddb93d23bce8d58b6c06eb5e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. While no scripts were explicitly extracted, the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary function is to host and redirect to external malicious content.

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://druttle.ru/award?keyword=castrol+edge+supercar+titanium+fst+10w+60+pdf PDF link annotation
    • https://nobozemesatib.weebly.com/uploads/1/3/0/8/130874372/xalefoli-xarejedobodun-mupuxidin.pdfIn PDF document text
    • http://rajenajodaf.iblogger.org/finifokukinesitukuz.pdfIn PDF document text
    • http://fullhp.info/the_mysterious_benedict_society_plot_diagramg8kxb.pdfIn PDF document text
    • http://sale20.site/solving_two_step_equations_and_inequalities_worksheet4t0wg.pdfIn PDF document text
    • http://gizesodawesiv.mywebcommunity.org/deontological_and_teleological_theories_of_ethics.pdfIn PDF document text
    • http://biwedujurar.mywebcommunity.org/calendario_serie_a_19_20_lega.pdfIn PDF document text
    • http://resipowepo.getenjoyment.net/breckwell_pellet_stove_troubleshooting_codes.pdfIn PDF document text
    • http://opensol.xyz/66812962541f5dnx.pdfIn PDF document text
    • http://mazanatur.space/33529219988b8wm1.pdfIn PDF document text
    • https://fewugoxozo.weebly.com/uploads/1/3/4/4/134441687/1069445.pdfIn PDF document text
    • https://bizavewes.weebly.com/uploads/1/3/5/3/135323934/fd098.pdfIn PDF document text
    • http://gelokan.sportsontheweb.net/xipakirexerifasiwolojobev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tipipigi.atwebpages.com/bovodabu.pdfIn PDF document text
    • http://xarujusezofa.epizy.com/zupevet.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/nice_guidelines_cks_endometriosis.pdfIn PDF document text
    • http://defoxumaxu.rf.gd/compendio_de_musicologa_jacques_chailley.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/mamudavorebininoviwijozoj.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/plugin_ocr_wondershare_editor_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/neporezofov/92562584308.pdfIn PDF document text
    • http://kijenor.epizy.com/dajefidagitirujirirofawi.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_off0000d310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD310 5820 bytes
SHA-256: fb7db4b301855bf00d742613b85c5c2c6d03ef65898bdfea36ba6fc368eceaa3
font_01_sfnt_off0000e6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E1 10864 bytes
SHA-256: 8fdff791a081a6eae10f5a0a457dc230b5b03c2b31350b7df8ef4104a0778973

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