Malicious PDF — malware analysis report

Static analysis result for SHA-256 387e990a9c9fd303…

MALICIOUS

PDF

84.2 KB Created: 2021-04-23 23:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 01c25600c19d211ff0d30db268287a19 SHA-1: cf2749200a5a4231f959910eb6b7dd3cac76d2e5 SHA-256: 387e990a9c9fd3033d4f3e9338ab68a71f40efef1c312134bc778f573987feb0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'fixing soft close toilet seats' to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gimoguvi.ru/strik?utm_term=how+to+fix+soft+close+toilet+seats PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417414/normal_5fe7db7734f17.pdfIn PDF document text
    • http://benilobodereji.mygamesonline.org/1997_yamaha_timberwolf_250_owners_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvivemu/bQWiiha/melubok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459776/normal_6046f34e89394.pdfIn PDF document text
    • http://gamuxiwami.getenjoyment.net/cloud_9_players_valorant.pdfIn PDF document text
    • http://posalak.22web.org/brothers_in_arms_earned_in_blood_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449614/normal_6065fd014b908.pdfIn PDF document text
    • https://cdn.sqhk.co/tavimuxeju/7hjr0jj/snow_bros_2_download_pc.pdfIn PDF document text
    • http://xilibinebosapeg.mywebcommunity.org/xugiweloxijuko.pdfIn PDF document text
    • https://cdn.sqhk.co/fibapezo/WMgdFBf/anti_heroes_in_literature.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368505/normal_5ffa408af1b35.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wawefib.rf.gd/wepamibulexororabixijoj.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/riragaduwopapisu.pdfIn PDF document text
    • https://b56e00ce-d729-42e9-814b-b9a4b194f5ba.filesusr.com/ugd/f6f93f_232c83ba3e584607838d51f8d88a376c.pdf?index=trueIn PDF document text
    • http://noroved.myartsonline.com/xobevukudowipediveg.pdfIn PDF document text
    • http://kiwusumusi.rf.gd/kanirurufem.pdfIn PDF document text
    • http://nupadiruto.rf.gd/dd_3.5_monsters_by_type.pdfIn PDF document text
    • https://104e3d6a-8609-4a5f-ba89-88df40aeb326.filesusr.com/ugd/3cb22f_54d83a094dfd4b099da05b711c0a235b.pdf?index=trueIn PDF document text
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_775b52dfaf2d427ba4f790d372f86ad9.pdf?index=trueIn PDF document text
    • https://8aefc570-8454-48c3-bb63-d4d1067b7ce0.filesusr.com/ugd/5c9621_48bf19fd2fc3480e83f3f2d4b677bf22.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/nakopujolovazuruwis.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_off00010bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF8 4900 bytes
SHA-256: c9605fc6b45604079cd4535fa6fd4efaa4118ed7b7b76627938bc239a3200747
font_01_sfnt_off00011cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD1 11272 bytes
SHA-256: ee257f644f2310287fbcea21fa58a1401c65c2be975b8d2a584a273725e91628

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