Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f81133f7429f01f…

MALICIOUS

PDF

65.4 KB Created: 2021-02-25 05:59:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6252666362127a965255f5f562fb2431 SHA-1: fcb9afb1a295e54988dd0aa2dc55b75d4c6f640e SHA-256: 5f81133f7429f01f88b03bb717bc5fa90734147360bae9c0cef6b90be32a5978
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to a common search query, aiming to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8600

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://jacksth.ru/award?keyword=how+to+remove+lg+refrigerator+light+bulb+cover
    • http://toteganutiv.66ghz.com/dowuzozixajibam.pdf
    • https://tivofemexire.weebly.com/uploads/1/3/4/0/134012880/9276938.pdf
    • http://mapotilij.mygamesonline.org/the_outsider_book_sparknotes.pdf
    • http://fajujefa.getenjoyment.net/diary_of_a_wimpy_kid_show_cast.pdf
    • https://savaxibinis.weebly.com/uploads/1/3/3/9/133997587/25f1000d8f.pdf
    • https://cdn.sqhk.co/kapopajij/2kWhgtD/bejekefe.pdf
    • http://zonerokemub.getenjoyment.net/how_to_create_a_word_cloud_from_excel_data.pdf
    • https://cdn.sqhk.co/netesatova/nhebehj/77266043384.pdf
    • https://ganakinupep.weebly.com/uploads/1/3/4/5/134599301/25a76462.pdf
    • http://bumasujofoj.getenjoyment.net/xelofupugo.pdf
    • http://gemubanabugawa.mypressonline.com/how_to_replace_igniter_on_englander_pellet_stove.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mefinuxewo.epizy.com/pasang_answer_back_system_di_nmax.pdf
    • http://zopijejezi.rf.gd/listening_assessment_marksheet.pdf
    • https://s3.amazonaws.com/buwosevax/audio_beats_premium_apk_free.pdf
    • http://tapopopabe.rf.gd/how_to_fill_marriage_registration_form_online.pdf
    • http://gogufujupi.rf.gd/bevulexumozodazof.pdf
    • http://nevigewiba.epizy.com/achtung_spitfire_free.pdf
    • http://defizal.epizy.com/family_members_worksheet_for_preschool.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d955.bin
4bff443a8543237f1a939e7a683453e584b96b808d3e4c9a9d71631c87c13c21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD955 5368 bytes

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