Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc857b7762f5ec4…

MALICIOUS

PDF

76.3 KB Created: 2021-04-15 14:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 238c2f3f103d74f7aae157699c3d2343 SHA-1: bbc3f92750927fdb9ed2c0a9c48e653e5deb5e1f SHA-256: 6dc857b7762f5ec49a79cd8a3114980fdd27f7496b3960de4f3795ec249305c1
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs, such as 'https://xezojetit.ru/strik?utm_term=garmin+vivofit+4+user+manual+pdf', are likely used to redirect users to malicious sites or download further payloads.

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 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://xezojetit.ru/strik?utm_term=garmin+vivofit+4+user+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/kesufetumo/gjghgj1/7866218812.pdfIn PDF document text
    • http://pasikufopubiwo.mypressonline.com/bible_stories.pdfIn PDF document text
    • https://cdn.sqhk.co/vigesiji/eIyO7jg/692406537.pdfIn PDF document text
    • http://forecast.bet/817938499898v9in.pdfIn PDF document text
    • https://cdn.sqhk.co/wapevenupu/iWihij4/preppers_discount_phone_number.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368229/normal_60359c299ae3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450036/normal_6036aba8c0fd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419433/normal_60191ee01b3bf.pdfIn PDF document text
    • http://studyweb.site/forge_of_empire_hacksjgtxv.pdfIn PDF document text
    • http://vnatural.space/did_it_again_shakira_kid_cudi_lyricst1y7h.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/entrepreneurship_development_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446401/normal_5fe178cc07300.pdfIn PDF document text
    • http://koolmaxt.online/ageing_report_meansvx0jp.pdfIn PDF document text
    • http://tomogorman.com/xulanegewewimawptt96.pdfIn PDF document text
    • https://cdn.sqhk.co/bitowiso/fqWpsr1/zombie_monster_hunting_simulator_codes.pdfIn PDF document text
    • https://cdn.sqhk.co/gasupewu/2ih2mjc/shopping_list_buy_me_a_pie_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416918/normal_6058f689b1b27.pdfIn PDF document text
    • http://xisumagogali.getenjoyment.net/how_to_use_jolen_face_bleach.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_607f3443b1574ed095facfc3ca019926.pdf?index=trueIn PDF document text
    • https://0b21792c-a699-4cf4-8833-5910c6ad58af.filesusr.com/ugd/b0b521_7bc0a675d1384d418b335adec216425b.pdf?index=trueIn PDF document text
    • https://30cc9e9c-6145-4029-bfdc-d0561bdb3a10.filesusr.com/ugd/0dcf4b_e5c8e13443c04fcc9e574920d138164f.pdf?index=trueIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_7b23c81d18ed4fc3ac47233115d4f957.pdf?index=trueIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_62be5025b2974ceb9b551825277e87c0.pdf?index=trueIn 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_off0000ea7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7B 5368 bytes
SHA-256: 7ffb9b3678e5d1fc5ec884cb69112f8ce1eac6c656af7abf8fe5047b3d45ccc6
font_01_sfnt_off0000fcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBA 11432 bytes
SHA-256: 50ac93657d2a39bd75f8e2f0923e052f243bfa15ede000aedf843d0947670f75

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