Malicious PDF — malware analysis report

Static analysis result for SHA-256 01b34c8a019a74bc…

MALICIOUS

PDF

71.8 KB Created: 2021-02-14 22:44:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9749cd0916bcec707e0fe9bc3a4929a5 SHA-1: c81bb40a840f3e34ffa6ecb2cef81ed1b2f40a1b SHA-256: 01b34c8a019a74bc7d3c8521b044e4d2a4e0b335d25e52932dbd9cc806fb1b36
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

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://jottigo.ru/aws?utm_term=b+m+hegde+books+free PDF link annotation
    • http://idealica-ufficiale.site/miku_hatsune_episode_1hixe5.pdfIn PDF document text
    • http://itabody.space/bendy_in_nightmare_run_mod_apk_revdldr25v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408321/normal_5fdaff6c70904.pdfIn PDF document text
    • http://kneeksi.ru/super_smash_bros_ultimate_lucina_guidej2te3.pdfIn PDF document text
    • http://aromaita.space/aaha_movie_songs_masstamilan3qbc5.pdfIn PDF document text
    • https://cdn.sqhk.co/firokizita/jny9hff/backflip_madness_hack_apk_download.pdfIn PDF document text
    • http://ubsvp.com/terminator_2_3dqey4g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465694/normal_5fe4522d34610.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416322/normal_5fcf337dcf285.pdfIn PDF document text
    • http://ufenmac.com/58703064374smp55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412778/normal_5fd0e35cdb08f.pdfIn PDF document text
    • https://cdn.sqhk.co/vobipibomuk/gcjghjd/marble_run_game_app.pdfIn PDF document text
    • http://ufenmac.com/food_chain_drawing_worksheethltem.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvisisitinu/jhLjejk/23447605808.pdfIn PDF document text
    • http://obmenkalnr.online/78811164357s8ko7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://debetofewozuri.epizy.com/chalanachitra_video_songs.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_off0000da44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA44 5332 bytes
SHA-256: 24cb287cbb95261329e807c4b1e9c456e0f2743f4b1a68645e6e29d713466199
font_01_sfnt_off0000ec43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC43 11564 bytes
SHA-256: c01cf2f2d51a7e9ccdd8e9c9261c04e1f7469ae5761ba8097a2de045c776ba72

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