Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1e95f7b3d0ddf6…

MALICIOUS

PDF

69.9 KB Created: 2020-11-24 13:37:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a46518bfe1bb88495b7ac0ff7465a65 SHA-1: 12460b4b8d9a336754aa5e86b259c1e422e1feb6 SHA-256: 3f1e95f7b3d0ddf6f29e536933463cc6fae5fd2460505be7f7a4e6038186197e
156 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating a link farm with numerous external PDF links, one of which points to a URL associated with a guitar chords software lure. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and external links suggest an attempt to redirect users to malicious or scam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/aws?utm_term=guitar+chords+software+free
    • https://fegixobipe.weebly.com/uploads/1/3/4/4/134467450/bivagok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/8e7c7c7a-1b45-4d8a-bf36-366f40ff602e/jirasofa.pdf
    • https://uploads.strikinglycdn.com/files/b8336007-9272-45f9-9a3d-cc0b8979b7a3/61711098036.pdf
    • https://s3.amazonaws.com/muvarelo/infinite_discontinuity_definition.pdf
    • https://uploads.strikinglycdn.com/files/19cd8b42-bc1b-40a4-ac11-bcc85a8c1de9/33066894973.pdf
    • https://s3.amazonaws.com/juvosi/69085202837.pdf
    • https://s3.amazonaws.com/jinotugiwomo/88719219288.pdf
    • https://uploads.strikinglycdn.com/files/8ff8c135-09ca-41b6-a1db-9e7bfaffcd5b/michael_paul_stavrou_mixing_with_your_mind_download.pdf
    • https://s3.amazonaws.com/fekazudabo/11584134200.pdf
    • https://s3.amazonaws.com/wixamupelinere/goribipazu.pdf
    • https://uploads.strikinglycdn.com/files/a66e59a3-5a3c-4006-92eb-5c9b8c8a8f15/zedaguvodubiduvitaxopevog.pdf
    • https://uploads.strikinglycdn.com/files/8207f87f-9a98-4f37-a3db-1374ee4cde22/my_hero_academia_episode_14_english_dub_funimation.pdf
    • https://s3.amazonaws.com/welutizenop/homeless_bird_book.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c803.bin
2efa6dbcea5c70911a7d355ddb7015c27b13233eec4fea78435c36fad1242ffe
pdf-font-stream PDF embedded font (sfnt) at offset 0xC803 4976 bytes
font_01_sfnt_off0000d919.bin
07a94c8399c48be5c9eb82db23e34761195d72e3744cf2c33da5c22043f05c8f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD919 10264 bytes
font_02_sfnt_off0000fc51.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC51 4324 bytes