Malicious PDF — malware analysis report

Static analysis result for SHA-256 f768c76365f87d49…

MALICIOUS

PDF

74.6 KB Created: 2021-05-18 08:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 868957d7c18602b9bb4012acafbea51d SHA-1: 2152ab59ce2fa10e15cea2020357f99033413978 SHA-256: f768c76365f87d49c731e31010888f1a68712bff77c345955b16932419541963
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a primary suspicious URL being https://dugedepap.ru/strik. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's purpose is to host a large number of links on disposable domains, likely to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dugedepap.ru/strik?utm_term=parts+of+speech+practice+high+school PDF link annotation
    • https://zoxopabetil.weebly.com/uploads/1/3/1/1/131163737/kibabodo-bireduz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481999/normal_5fe4d61ead40e.pdfIn PDF document text
    • https://puruvafapazono.weebly.com/uploads/1/3/0/8/130815059/aaab9a80.pdfIn PDF document text
    • https://wumikedamuzu.weebly.com/uploads/1/3/4/3/134324885/desifedekamu-xufoxovake.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393209/normal_6041fa885f078.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374371/normal_5fe187271d229.pdfIn PDF document text
    • https://wivixape.weebly.com/uploads/1/3/4/8/134897282/mivasewatoze.pdfIn PDF document text
    • http://gekalam.22web.org/hernia_umbilical_en_nios.pdfIn PDF document text
    • https://gazonigupeti.weebly.com/uploads/1/3/4/8/134879892/5795907.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498978/normal_5ff508b11b459.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369183/normal_5fe03cb4c10e1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wibofupenavoj.rf.gd/40318858846.pdfIn PDF document text
    • http://runoxujozu.rf.gd/vowuxobuwatog.pdfIn PDF document text
    • http://merawaboz.epizy.com/cyanogenmod_android_roms.pdfIn PDF document text
    • http://sefogozi.epizy.com/beforakanox.pdfIn PDF document text
    • http://laverowe.epizy.com/cakewalk_pro_audio_9_windows_10.pdfIn PDF document text
    • http://rozogev.rf.gd/12026761023.pdfIn PDF document text
    • http://dumadanovoj.rf.gd/cant_start_modern_warfare_ps4.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/57484883845.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/mixogonurunagaf.pdfIn PDF document text
    • http://tekumaworinebu.rf.gd/63181025646.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/96983987018.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/vanilla_twilight_piano_sheet_music_musescore.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_off0000e3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D7 5276 bytes
SHA-256: 6b6692737e7aeec3749066b7f240881e33a6948cf3d7c1590d6e7fc7d4afc870
font_01_sfnt_off0000f5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C9 11024 bytes
SHA-256: 15e3a69dff41babdb8cc796f8d6179817fa80406645150010ad1afaa5f206ff3

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