Malicious PDF — malware analysis report

Static analysis result for SHA-256 36e5d86b1ea2d840…

MALICIOUS

PDF

72.3 KB Created: 2021-06-09 06:40:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b52b37a5b8a05caeb8d884e87e8a3d7 SHA-1: aa1aef5cb1e5214ece8ed5fa710ce6793f604549 SHA-256: 36e5d86b1ea2d84098bba04f4d0193e168e27529e81e634f6137da0803aaa9af
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, with one prominent malicious URL pointing to 'oniceh.ru'. ClamAV and an ML classifier also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the nature of the link farm suggests an attempt to redirect users to malicious content or phishing sites.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://oniceh.ru/pbw?utm_term=ielts+writing+task+1+general+sample+answer+band+9
    • https://static.s123-cdn-static.com/uploads/4381289/normal_5fe13a1dd26ea.pdf
    • https://static.s123-cdn-static-d.com/uploads/4367268/normal_60b3bc878d781.pdf
    • https://cdn-cms.f-static.net/uploads/4391331/normal_602ec9a1e4ba5.pdf
    • https://rulukipa.weebly.com/uploads/1/3/4/3/134329123/tomopep-keridufin.pdf
    • https://virikewujolitof.weebly.com/uploads/1/3/2/7/132712461/6e88cbb14.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/46841d13-2fe1-4391-a992-8800fb7eeaac/how_to_play_modern_magic_cards.pdf
    • https://uploads.strikinglycdn.com/files/557b77a3-4e62-4304-b2bc-7dd462c1ecf3/benefits_of_centralised_curriculum.pdf
    • http://deduxofevit.pbworks.com/w/file/fetch/144680949/bossier_city_jail_arrests.pdf
    • https://uploads.strikinglycdn.com/files/13c2d937-ec24-41f3-b069-2aacbfdd1f18/sosavezimi.pdf
    • https://uploads.strikinglycdn.com/files/ce7656eb-af19-454d-9ae7-1e4bfc42f71b/what_is_developmental_editor.pdf
    • http://garigor.pbworks.com/w/file/fetch/144568578/random_video_call_no_app.pdf
    • https://uploads.strikinglycdn.com/files/7898336f-0000-4a70-9d65-40d20d945567/short_story_ideas_for_adults.pdf
    • https://uploads.strikinglycdn.com/files/26816b2f-0bff-4ec5-9dd3-3a46dd413e19/konatexep.pdf
    • https://uploads.strikinglycdn.com/files/78ee06b9-2952-4c3f-b287-a7baba996401/23132791527.pdf
    • https://uploads.strikinglycdn.com/files/c3246a17-e59a-4df9-9b6a-9020a638a151/92303802119.pdf
    • https://uploads.strikinglycdn.com/files/f7ecd5b7-2a0b-4e7c-a082-c1cba2febda7/home_zone_security_light_review.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_off0000db71.bin
2c8e773001c6e5e4d1c8866097e2c677081cb077e8e7b5a45ef57b3b7563b4ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB71 5720 bytes
font_01_sfnt_off0000eedb.bin
606b73014305ddd378826326fec30cdb34b0d315fbf5f484bec8530d8d99b998		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDB 10328 bytes

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