Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceadab8d74e6028f…

MALICIOUS

PDF

106.9 KB Created: 2020-12-17 00:34:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 387cf3726b9c7af157b12e7d95cbea3d SHA-1: 75c14b34ad70307237d1fd8d576595a8a7b465eb SHA-256: ceadab8d74e6028f63c2323b1372773c955d8931d5f6ba209cfc3e9e659fed6e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it is part of a link farm designed to redirect users to potentially harmful websites. The embedded URLs and the heuristic firing 'PDF_SEO_LINK_FARM' strongly suggest the document's purpose is to drive traffic to these external resources, likely for phishing or malware distribution.

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://traffset.ru/aws?utm_term=lupus+nephritis+management+guidelines+compared
    • https://nimaxosonoj.weebly.com/uploads/1/3/4/8/134897368/gejomobifino.pdf
    • https://sijilosak.weebly.com/uploads/1/3/4/4/134476358/553048.pdf
    • https://cdn-cms.f-static.net/uploads/4494888/normal_5fd3166dd2362.pdf
    • https://jinerepesejo.weebly.com/uploads/1/3/4/5/134576949/zutuxed-runatanuzo-zenetobulok-denofunawaso.pdf
    • https://vasinurevesodux.weebly.com/uploads/1/3/4/6/134605286/3656759.pdf
    • https://static.s123-cdn-static.com/uploads/4420476/normal_5fcea5e279f62.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf3b4cc750a3b5a0543e3/1606218689921/divaf.pdf
    • https://uploads.strikinglycdn.com/files/dcb0b891-c7da-4a8c-8536-26d62a02886a/prince_hall_masonic_quiz_book.pdf
    • https://uploads.strikinglycdn.com/files/7d3a193b-01ea-4e62-b522-c8ef06a40578/themes_in_the_road_cormac_mccarthy.pdf
    • https://static1.squarespace.com/static/5fc2f8256b97992eb5696e44/t/5fc6c7261d689b68bf860a39/1606862630731/73042682537.pdf
    • https://uploads.strikinglycdn.com/files/6df117e9-82db-42cb-ab94-5138ca2f4a2f/mewak.pdf
    • https://uploads.strikinglycdn.com/files/0799dd91-a239-4193-b903-9f65b9cfa45e/devuvexuxidiwupatipami.pdf
    • https://uploads.strikinglycdn.com/files/aca0553c-87f5-4105-9eaf-c360f630528b/jamixuxekeresamovebof.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd119ef7819f6264dc7d85/1606226335371/niwetaxoguvubefopowivu.pdf
    • https://uploads.strikinglycdn.com/files/5ef6e857-ca02-4858-9c83-0ce3222faa29/buzabimekil.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014da3.bin
3d345a2e32ef7279f44bd17633af4c64c57708a3ceeef25e40b3e6e6f79ed559		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14DA3 5428 bytes
font_01_sfnt_off00015ff2.bin
b2d0cc879b66e9583f303d735d5e0b698edfb2e98af43d1efa7e2211fd1f5d12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15FF2 12596 bytes
font_02_sfnt_off000188aa.bin
aabbb95e4258a1bccfe6759090a0a8b97a33e8154131110566ffb2eaa8fdb080		 pdf-font-stream PDF embedded font (sfnt) at offset 0x188AA 16148 bytes

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