Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6a7f69d6520363…

MALICIOUS

PDF

78.0 KB Created: 2021-03-22 01:54:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f1007376816cfabf40edc9656bf37e8c SHA-1: ed1e010887480d387de9b583bcf0fcff9fe2989e SHA-256: bc6a7f69d6520363edd845026c3989108fda7d323be70f4c54d6517244842d5e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'interview answers', which is likely a pretext to direct users to malicious sites. The presence of external URIs and link farm heuristics indicates an attempt to distribute or redirect to malicious content.

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://zajinet.ru/123?utm_term=interview+answers+disagreement+with+boss PDF link annotation
    • https://cdn.sqhk.co/wezufunin/ihaQHEu/stardust_dragon_wallpaper_hd_1080p.pdfIn PDF document text
    • https://cdn.sqhk.co/xurawupo/JTl9gfI/12323777321.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412757/normal_5fdaec0206be8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387825/normal_60535e1e60e5c.pdfIn PDF document text
    • https://cdn.sqhk.co/tufuboloruj/jjjhdhg/css_grid_responsive_website_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_601b51d38dd1c.pdfIn PDF document text
    • https://cdn.sqhk.co/liwifetil/eOXhaje/friends_justin_caruso_mp3_download.pdfIn PDF document text
    • http://zejazan.iblogger.org/compound_nouns_exercises_with_answers_for_grade_5.pdfIn PDF document text
    • http://velibabup.iblogger.org/1083384052.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465131/normal_60225f49b3e3e.pdfIn PDF document text
    • http://dapumad.iblogger.org/46144758144.pdfIn PDF document text
    • http://lovoravemufedoz.22web.org/wordpress_themes_for_photographers_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/xadeviro/Tnigmgh/700_espn_seattle.pdfIn PDF document text
    • http://lirituniwati.22web.org/cisco_meraki_firewall_datasheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xipawiwakob.rf.gd/diary_of_a_wimpy_kid_rodrick_rules_full_movie_free_watch_on_youtube.pdfIn PDF document text
    • http://gefimosikalet.rf.gd/pofimedinujanivadajomuxa.pdfIn PDF document text
    • http://naxepatixotilu.rf.gd/regosisoxikudugitol.pdfIn PDF document text
    • http://rizaraj.rf.gd/arterial_blood_gas_interpretation_book.pdfIn PDF document text
    • https://16012499-1299-48b0-8cdd-5f23a7749958.filesusr.com/ugd/fafc38_68b05130cde74f5086fbaae9a52b4945.pdf?index=trueIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_8db7fe9bea6844ba830cd472ffde00aa.pdf?index=trueIn PDF document text
    • http://sumoxajavagal.rf.gd/lajozew.pdfIn PDF document text
    • http://tilanetojik.rf.gd/74226391665.pdfIn PDF document text
    • http://bobamexexaru.rf.gd/31274819451.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_off0000f249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF249 5436 bytes
SHA-256: 24a8b943be5b7725feefde2785f31f15705df25724ad6e822e4c21cab50e5ca7
font_01_sfnt_off000104ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AC 11320 bytes
SHA-256: 9ce69e78c3129c5e88206dac1b8dbb8a7ff482d448a5d3273ee07a7d264d534f

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