Malicious PDF — malware analysis report

Static analysis result for SHA-256 c65c9d31fc2189e1…

MALICIOUS

PDF

77.8 KB Created: 2021-05-24 18:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: fadb08a744fde6c0f0b92207d66e618a SHA-1: 213b1c271e4fc1909cd6b97bab11b8d3327fb8fb SHA-256: c65c9d31fc2189e1b2d2abcbb48263ab17cf6c7dea16850d47e9aa7c93881cb0
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDFs hosted on various platforms. One prominent URL, 'https://baarspo.ru/strik?utm_term=spyro+reignited+balloonist+installing', appears to be a lure for users searching for specific software. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 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.
  • 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://baarspo.ru/strik?utm_term=spyro+reignited+balloonist+installing PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407807/normal_604b035e64f21.pdfIn PDF document text
    • https://govipilod.weebly.com/uploads/1/3/4/6/134651664/vudizipofati.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464525/normal_6034dcf7c08a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488815/normal_5fd771dba0064.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464330/normal_601c68254aecb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424953/normal_5fdc6afeaf41e.pdfIn PDF document text
    • https://sowubibuf.weebly.com/uploads/1/3/4/3/134308786/1067570.pdfIn PDF document text
    • https://dodevapamoj.weebly.com/uploads/1/3/4/3/134352329/9121421.pdfIn PDF document text
    • https://roparinupiw.weebly.com/uploads/1/3/5/3/135392621/duxenikabe.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/a1327a71-05eb-4536-b898-7fc8363b246d/55689598296.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/talk_to_you_tomorrow_formal.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/vobufokekitos.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/canon_digital_photo_professional_windows_vista.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/daily_english_speaking_practice_through_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/skyrim_time_slow_bug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25c90010-5909-48d4-a3a4-1e1b2a7fcba5/98908353545.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/nulupisij.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/305524018.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_off0000e6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E8 5472 bytes
SHA-256: c4f02331740602b3dfa820d6e27c9c2fd228eb0c3245b3b043e3ee648c250926
font_01_sfnt_off0000f98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98A 14748 bytes
SHA-256: 726745253d7d05ffce2ef131031d14ec53f13a56d4c25e0724e7fec5e8fd5579

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