Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a8e1f733d79601…

MALICIOUS

PDF

78.2 KB Created: 2021-03-08 22:40:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a6f22bfe6bb152050686e6641005f4ea SHA-1: 05e9ad99a15db9a6319cd8c1dc282bdd2f8763d6 SHA-256: 05a8e1f733d7960137594faee32a0444e629a60083ce2e432c5054e4b33911e4
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a primary focus on 'vilenefex.ru', suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, appears to be a lure related to design elements, which is a common tactic for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://vilenefex.ru/strik?utm_term=definition+of+value+in+elements+of+design PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419437/normal_6020feae8222d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381730/normal_60302f5447525.pdfIn PDF document text
    • http://tapozifokun.mywebcommunity.org/why_stock_is_falling.pdfIn PDF document text
    • http://easterthjg.com/kojakusasaxamuwac30th.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369784/normal_5fca81b13381e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387033/normal_60298d1a1f457.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446917/normal_603260b41f528.pdfIn PDF document text
    • http://vevaxogejaz.scienceontheweb.net/can_lower_back_pain_be_cured_by_yoga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485153/normal_6006e15d79770.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478133/normal_5fed6c35e97da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393508/normal_5fc91b261c2cf.pdfIn PDF document text
    • http://roman-holidays.shop/81504436731ui75q.pdfIn PDF document text
    • http://heartcenteredequestrian.com/zombieland_2_netflixkpo3i.pdfIn PDF document text
    • http://lnstagramverifiedbadge-media.com/vowakirufomowivuferomabvhgz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465131/normal_602dc8b88ead0.pdfIn PDF document text
    • http://rocketdocs.us/how_to_convert_graco_nautilus_into_boosterr5qd8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445321/normal_5ff13af27e60a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423427/normal_600ebc61cdde2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413223/normal_601dbb262eaad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2584de1c-9dd4-421e-949d-3f8056f02f2a/can_i_air_fry_on_keto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec048898-6b62-4f16-b532-679127717f8b/cheapest_way_to_travel_from_tokyo_to_mt_fuji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c1de201-3fb2-4058-b5b5-5097b1a24ef4/57384199141.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f223708d-8f3a-4a16-95a1-40fa0d8c00c3/wegalakimerinudadezax.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_off0000f5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D4 5192 bytes
SHA-256: 7b9dd5022c42cf25a61c5b2168588380f55051af3a49b8a72aae298d411cfcd7
font_01_sfnt_off00010782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10782 10356 bytes
SHA-256: 550a57a177c3507ed4de353f094aab6a257eb9b8b70ed1e05e580ce983a5bcc2

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