Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fdeff6035e6704a…

MALICIOUS

PDF

78.9 KB Created: 2021-04-01 10:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6aa9987dd5a7a2bfff01aee4d59dc605 SHA-1: bb3bd1ff1fa20ae53bbb8b751e4a9fea398bb9b9 SHA-256: 0fdeff6035e6704a0714560fd1c88aef8dd018fbb153324aa2ec791364f1e05c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=basic+electronics+components+testing+pdf
    • https://cdn-cms.f-static.net/uploads/4419192/normal_60446ec4167e1.pdf
    • http://dokakepitizix.medianewsonline.com/a_burnable_book.pdf
    • https://cdn-cms.f-static.net/uploads/4481061/normal_5fdc511fa2cd1.pdf
    • https://ginixogigifigat.weebly.com/uploads/1/3/4/3/134367444/sitikajomako.pdf
    • https://cdn.sqhk.co/xewafazuk/jbgchcz/how_to_get_walmart_money_card_routing_number.pdf
    • https://cdn.sqhk.co/menekilebuz/jjhihhl/dead_man_walking_jeremy_camp_live.pdf
    • https://cdn-cms.f-static.net/uploads/4409394/normal_600fed7ee9d09.pdf
    • https://cdn.sqhk.co/tamoravuwera/g1ibFjh/wurinelilisuwe.pdf
    • https://cdn-cms.f-static.net/uploads/4383681/normal_602aea2c56de9.pdf
    • http://tebeririz.scienceontheweb.net/diferencias_entre_absceso_hepatico_amebiano_y_piogeno.pdf
    • https://cdn.sqhk.co/ronofumito/jb4rhiI/44112744486.pdf
    • https://cdn-cms.f-static.net/uploads/4472491/normal_5fdace4bbb996.pdf
    • https://peziwotikiju.weebly.com/uploads/1/3/4/6/134602895/sipavarowafu_bojemadi.pdf
    • https://cdn-cms.f-static.net/uploads/4427091/normal_6049b03e72824.pdf
    • https://cdn-cms.f-static.net/uploads/4423189/normal_6039ae0deea93.pdf
    • https://zobilajes.weebly.com/uploads/1/3/2/6/132682335/443531adf176c3.pdf
    • https://cdn.sqhk.co/libavesonon/ibmhihb/viking_gummistvlar_storleksguide.pdf
    • https://cdn-cms.f-static.net/uploads/4450501/normal_605433a2e18e8.pdf
    • https://cdn.sqhk.co/kusedesomawa/7NOJjgE/dogotasaxewonokelu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://pudolajuji.atwebpages.com/65365074548.pdf
    • http://lodumojokexiku.onlinewebshop.net/71216926158.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9da.bin
53a2e899c5c4455e643267552a4e40a5d78b41a9d0ade36b5b551f65cd95b509		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DA 5312 bytes
font_01_sfnt_off0000fbc0.bin
13892f55002a111a1f528202e65b1d9cd3167ade9b9ac89d6d7981cb763dfbd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC0 10604 bytes
font_02_sfnt_off00011fbf.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBF 4324 bytes

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