Malicious PDF — malware analysis report

Static analysis result for SHA-256 0423b4c997c160be…

MALICIOUS

PDF

132.7 KB Created: 2020-11-10 21:14:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1a55daed891cb0a456464632d29524c4 SHA-1: 7f04f537e2625b09d274a0301463c5d409459c76 SHA-256: 0423b4c997c160be599608ff61645217b393bafece56c5d310559f0e5ca1d501
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pattern. The document body, though heavily obfuscated, suggests a lure related to 'Reasons for seasons worksheet answers'. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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://trafffe.ru/strik?keyword=reasons+for+seasons+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380680/normal_5f9ca0f5e767d.pdfIn PDF document text
    • https://kukezedom.weebly.com/uploads/1/3/4/6/134629177/jilivefinek.pdfIn PDF document text
    • https://gixeguxif.weebly.com/uploads/1/3/4/5/134522915/185a56d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/patotale/4x4_soccer_unblocked_games_77.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8ccd6fc-19e9-4963-8342-2f0c2a07d95a/89092516454.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b1bdfd7-7cb1-44d2-af73-1f642215858b/rerelotelefenapuxuse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5079ad0a-861b-4623-9289-f5ca4ad401f9/zevasu.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/zojakupumojune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e3185bd-7aa8-4090-88c8-d833876226e0/wodabupozego.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/943d5ec3-4b74-4105-a38c-262d45ea3b1a/18698629950.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/phillips_rc122_manual.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_off0001cccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCCF 4984 bytes
SHA-256: c2493e17420368dea97beaaf92dafea6e3439c31945fe767ec21ab086c449105
font_01_sfnt_off0001ddd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DDD3 11720 bytes
SHA-256: 64b7fb83319b5884df092d68451bcaab890311b62d49b6908dcd4aff1df3ce17

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