Malicious PDF — malware analysis report

Static analysis result for SHA-256 33297ce6e98b0ac2…

MALICIOUS

PDF

76.9 KB Created: 2021-03-28 11:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8121daad6abcadd2fa46e50af8481e9 SHA-1: 7c0aa6787cbad6ecdd48714f4dba3359b3a0b645 SHA-256: 33297ce6e98b0ac2f39287778cfd47f4c32f975aad5a7e4c6508eb6ea1808c62
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', indicating it was likely generated by a tool rather than being a legitimate document. The presence of external URIs and a PDF link farm heuristic strongly suggests an attempt to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/wix?keyword=summoners+war+fire+beast+team
    • https://davokirik.weebly.com/uploads/1/3/0/7/130739121/pewuxoviritobeweme.pdf
    • http://acgmgroup.ru/62629087321ppc03.pdf
    • http://nout-prodat.site/wow_legion_affliction_warlock_guidefdhip.pdf
    • https://janodiwuzujemux.weebly.com/uploads/1/3/1/3/131382133/xizemopoger.pdf
    • http://choosemadam.site/45827296905k60.pdf
    • http://zofoxexizoviro.iblogger.org/kivupuninopib.pdf
    • http://neojust.ru/gizugajoruzaralajuwilouf1m2.pdf
    • http://ewop.space/70146817706tcqr5.pdf
    • http://dobomasinuraz.iblogger.org/37755957559.pdf
    • https://sajofagexureleb.weebly.com/uploads/1/3/4/6/134652103/fosamudazuv.pdf
    • https://vavaxurose.weebly.com/uploads/1/3/0/7/130775274/zonufuvi-dagowepewuwu.pdf
    • https://tiketutowiko.weebly.com/uploads/1/3/5/3/135345961/9ccf38052decc.pdf
    • https://gigunomivu.weebly.com/uploads/1/3/0/9/130970016/2633118.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sexofademuga.rf.gd/1997_ford_7.3_diesel_fuel_system_diagram.pdf
    • http://kesupipipiret.onlinewebshop.net/verbal_ability_and_reading_comprehension_book.pdf
    • http://muluwokixo.onlinewebshop.net/xesonenaru.pdf
    • https://535f918c-e50e-4760-9dbe-4b22a9cc1357.filesusr.com/ugd/65883d_26bc17097b2a42e2827f61b1cbc59f90.pdf?index=true
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_6abb3822be8b43188715c8fff79d9e91.pdf?index=true
    • http://felepav.epizy.com/pasir_ris_crest_secondary_school_uniform.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e38b.bin
3ce2e8807d77af7c1aace8e5947f56c3a62aac65adb94de0727899a524aa3c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE38B 5216 bytes
font_01_sfnt_off0000f540.bin
ae52eaa69d3a20d218b7f130b1a6e49bff0e84b1db560415a952e8f20c760ea8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF540 21380 bytes

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