Malicious PDF — malware analysis report

Static analysis result for SHA-256 50fc69064abb53c0…

MALICIOUS

PDF

72.2 KB Created: 2021-02-25 13:54:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: f3dfbba2f10ce98664a0bdb1b1ec2eea SHA-1: 69a13c080d8328ec10c274ebb47849638053281f SHA-256: 50fc69064abb53c0f21df47fc31b045401f739ee526aa3781bcefd9d2f6d550c
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to `https://seumenha.ru/strik?utm_term=how+to+fill+air+force+form`. The PDF structure and the presence of external URIs indicate it is likely used to redirect users to malicious websites, potentially for phishing or further malware delivery.

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://seumenha.ru/strik?utm_term=how+to+fill+air+force+form PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413244/normal_5fcea2524d168.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/heTF9qI/mario_party_10_amiibo_rosalina_board.pdfIn PDF document text
    • https://cdn.sqhk.co/winelolibug/EuIpijs/projector_vibration_isolation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380070/normal_60183922603a9.pdfIn PDF document text
    • http://lofajemami.sportsontheweb.net/what_is_the_difference_between_dewalt_and_dewalt_xr.pdfIn PDF document text
    • https://cdn.sqhk.co/woberimi/xzifLi2/gikezezifaxubipekelunepis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393362/normal_601d237e64c7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485926/normal_6015b777580f5.pdfIn PDF document text
    • https://cdn.sqhk.co/rubutemoxe/hFjcjhd/vomimikobujep.pdfIn PDF document text
    • http://pofuxubilet.sportsontheweb.net/bulonivabelesuviraviban.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366010/normal_5fdf566de7b11.pdfIn PDF document text
    • http://medebupima.sportsontheweb.net/91224162156.pdfIn PDF document text
    • https://cdn.sqhk.co/wemojezuvegi/gcthfge/extreme_landings_free_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rogofideb.onlinewebshop.net/37119990908.pdfIn PDF document text
    • http://jisijuvod.myartsonline.com/pelutuwos.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_off0000e044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE044 4900 bytes
SHA-256: 198b201f1896dd6ddf1b399e8b1c7bc6e2ab530397e8b5a9b6b2e85029c1193f
font_01_sfnt_off0000f0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0ED 10212 bytes
SHA-256: ea9189af93862c060f00806b8232edd524edb6440d0c04311f9a869dedf69483

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