Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f6b1a9fad39b1f0…

MALICIOUS

PDF

71.7 KB Created: 2021-02-27 04:22:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d934e9b5a64dc72379e7d609dcb6f6a4 SHA-1: 4caece87a632490b2ecdf39746a1f62bbbbd8174 SHA-256: 0f6b1a9fad39b1f027c9f69c292239c97ba4862b7fbb5bf0fc60cd552c5a3ce5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically flagged as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/wb?keyword=universidad%20del%20tolima%20carreras%20a%20distancia%202019 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4415304/normal_5fc9ab505e67f.pdfIn PDF document text
    • http://nowukusox.mypressonline.com/2014_club_cart_lift_kit.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/eriksons_stages_of_development_scholarly_articles.pdfIn PDF document text
    • http://kuxuvajivor.iblogger.org/16065905428.pdfIn PDF document text
    • https://cdn.sqhk.co/rilixuzewiv/rJcggzD/fun_run_3_multiplayer_racing_games.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/jevomemulofezepixoxoroj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386609/normal_5fdd485524cbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402503/normal_6033d2c7c05f3.pdfIn PDF document text
    • http://gexomafe.mypressonline.com/rain_dial_rd_600_manual.pdfIn PDF document text
    • http://rubewox.sportsontheweb.net/81365637323.pdfIn PDF document text
    • https://cdn.sqhk.co/patagarinixa/cgggghe/casse-_o-_player_premium_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/losomilodip/hfz5hck/f1_2016_ps4_multiplayer_split_screen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://robirevi.epizy.com/naming_saturated_hydrocarbons_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/nijetozote.pdfIn PDF document text
    • http://danofawo.rf.gd/natuped.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/converting_decimals_to_fractions_free_printable_worksheets.pdfIn PDF document text
    • http://diwavubodinaroj.myartsonline.com/ruwebegoluxogewu.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/felexupipofu.pdfIn PDF document text
    • http://wotonopeg.epizy.com/23482115610.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/lubotoxilovuvetekib.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_off0000d88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88B 5620 bytes
SHA-256: 31a1b698c8ca2615faa757bf9b0b9869682ab71c18ac4694a8d3f8eed15f8d0b
font_01_sfnt_off0000eb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9A 11152 bytes
SHA-256: f22dbb5d3497fda7f35f55514dcfb180dac302ecfa27b3559e9514d2cb1b6f95

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