Malicious PDF — malware analysis report

Static analysis result for SHA-256 879cc838062fb52b…

MALICIOUS

PDF

71.6 KB Created: 2020-11-13 23:41:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 42265c124d8b07906c56d5560eb24da0 SHA-1: 1e0fe8234de9e22c7f866cc069d1b4c59e599478 SHA-256: 879cc838062fb52b177c0b1c983f05ab9ae1892b2ed2faf5e7fae35bc90378ab
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://traffset.ru/strik?utm_term=um+padr%25C3%25A3o+de+perder%252Fobtendo+o+peso+%25C3%25A9 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444374/normal_5f9e7f0036b0c.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/9806665.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369504/normal_5f893f5949918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372101/normal_5f926e70f3027.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409806/normal_5f9d65853562b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/9d3ab01f-41a8-42ef-936c-07e7b975dd08/tonimem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cadc980-4a67-4e02-ae65-a0a895b2859f/natapus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc23a8a6-8d84-43f4-9f73-7c01d650f77d/anime_battle_3.5_unblocked_games.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/32626356999.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ff23b6e-fcdd-44a5-9ddd-c9581875847a/unit_6_study_guide_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37da38b6-1160-47ff-89d1-08c0ffc2dc6e/que_es_un_wombat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e02746b-847a-4b05-9597-1ae06f125a9d/10640574344.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/zasuguz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D4 5440 bytes
SHA-256: a4cd80df1e0773f2ba49e4a30a5d898fe2f5bf69595f50f074423af0a5bd21b9
font_01_sfnt_off0000da54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA54 13152 bytes
SHA-256: ed48dec5bc176692537c400023862f92d0c164e94c1fc3536eff671404db88ae
font_02_sfnt_off00010192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10192 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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