Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e05a736b4bc478f…

MALICIOUS

PDF

94.0 KB Created: 2021-03-06 12:07:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6608a5c85d036da2568c8de52e2767da SHA-1: 7fbebed61efc40b697bac89f5bd90dc7966cd945 SHA-256: 8e05a736b4bc478f110fcb753c76f636ef1416c37a2af539ae6ed25ac387d5db
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, with a critical heuristic firing for a PDF link farm. The ClamAV detection and ML classifier also indicate maliciousness, specifically flagging it as a phishing trojan. While no scripts were explicitly extracted, the nature of the embedded links suggests a phishing or SEO spam campaign, likely initiated via spearphishing.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=saratoga+tv+listings
    • https://jolosusopafo.weebly.com/uploads/1/3/4/0/134097145/paxozifa.pdf
    • https://finukezazilifer.weebly.com/uploads/1/3/0/7/130776017/kolamexatisud.pdf
    • http://piwulag.sportsontheweb.net/what_is_the_central_theme_of_we_wear_the_mask.pdf
    • https://zezevibowavaki.weebly.com/uploads/1/3/4/8/134854125/dafidefu.pdf
    • https://cdn.sqhk.co/xuxiropuwomo/igFwUhJ/arkham_knight_quickfire_line_launcher_xbox.pdf
    • http://wodedutipif.medianewsonline.com/sozalozajatukotepumu.pdf
    • https://cdn.sqhk.co/jotenitix/hgdSmgd/hidden_escape_temple_mystery_walkthrough.pdf
    • https://cdn.sqhk.co/pifonode/khhxTI4/boduvok.pdf
    • https://rigafefabapamum.weebly.com/uploads/1/3/4/4/134486683/mijegidi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7bb61bf0-09f6-4f0e-82c4-83099d9d57ae/how_to_get_to_firmament_ffxiv.pdf
    • https://s3.amazonaws.com/lulelepese/4161154254.pdf
    • https://uploads.strikinglycdn.com/files/5b4180a2-163b-4025-9fba-4c4920356d83/which_watch_brand_is_best_for_ladies.pdf
    • https://s3.amazonaws.com/semuxemakaw/fogewipumuxegodigobajawo.pdf
    • http://paguxesij.myartsonline.com/wozepunidazemusef.pdf
    • https://s3.amazonaws.com/fobupojowojon/favoxitabogosidod.pdf
    • https://uploads.strikinglycdn.com/files/0ddec1b0-88aa-4479-8e1d-cf34667cf217/vozixulawagixiti.pdf
    • https://uploads.strikinglycdn.com/files/e5b72f3a-148a-4cf6-a91c-0bbdb835b5d6/wifanalegupepeverazulo.pdf
    • https://uploads.strikinglycdn.com/files/4384a62b-51f9-4a5c-b0fd-22958a67763f/6203927583.pdf
    • https://uploads.strikinglycdn.com/files/7d1e5178-e597-49b2-97bd-58bb0e830188/nenugopowifutak.pdf
    • https://uploads.strikinglycdn.com/files/0bb6c238-9102-4c93-8afe-8d28f9fe0f12/how_to_teach_adhd_students_math.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_off00012b6a.bin
ec844e155b53357e4b693fcb66cfab0e6fe8945367fd57473c8a6293cbdc2210		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6A 5016 bytes
font_01_sfnt_off00013c8d.bin
61d7af0ea34ac77cf4fb553dfd0886572b39b9bb9c49e0b3be350de7ab01d260		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C8D 14836 bytes

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