Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a9f1f46366abf54…

MALICIOUS

PDF

79.0 KB Created: 2021-03-07 07:21:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 201b8b00e44d874a76e75a28cbef95f4 SHA-1: 3cbf67b60cd56f26b0a47ece42810df35a9db842 SHA-256: 3a9f1f46366abf54d9b96b3ed0431a9350c07759a36701d4d5ffc06be97b7190
134 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least one pointing to a link farm on disposable hosting, and another suggesting a download lure. The presence of these elements strongly indicates an attempt to trick the user into downloading further malicious content or visiting compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=the+secret+documentary+movie+free+download PDF link annotation
    • http://tujasumetozuku.22web.org/what_generation_kindle_is_g000.pdfIn PDF document text
    • http://carinsusa.com/3257429405bw9kb.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/b95gelm/77196824643.pdfIn PDF document text
    • http://powerhdniy.space/how_to_pair_a_jawbone_bluetooth_speakerfjo4f.pdfIn PDF document text
    • https://cdn.sqhk.co/gapalagabig/EbR9ehj/cute_wallpapers_yellow_butterfly.pdfIn PDF document text
    • http://drive4mclaneeffingham.com/vopesetemkcldy.pdfIn PDF document text
    • https://cdn.sqhk.co/raxulaxesob/gSgd5FB/live_police_pursuit_los_angeles_now.pdfIn PDF document text
    • https://cdn.sqhk.co/gimexigerub/3mf6V6w/tevatig.pdfIn PDF document text
    • http://vitefadu.iblogger.org/zee_bangla_tv_serial_song.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/yAjbvha/kajojirexe.pdfIn PDF document text
    • http://vadigoz.iblogger.org/how_to_put_baby_in_ergo_forward_facing.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lajejuzival.rf.gd/xexumafagobajosixegotozax.pdfIn PDF document text
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_b8616d18458649dfbb1389d1aeb3ad25.pdf?index=trueIn PDF document text
    • http://kivutivepew.rf.gd/22995593785.pdfIn PDF document text
    • http://nofodavegowizo.rf.gd/kikenitixiti.pdfIn PDF document text
    • http://relisedozoru.epizy.com/kimuxabiletowisexe.pdfIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_84d077247ecd4a9f81cc8c7df27d7bf5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/badmash_company_free.pdfIn PDF document text
    • http://bilovamoguloliv.epizy.com/30861834183.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/how_to_report_spearman_correlation_results_spss.pdfIn PDF document text
    • http://sajurewe.rf.gd/jagov.pdfIn PDF document text
    • http://mafevela.rf.gd/18127636186.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/spreadsheet_app_for_ipad_2.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_off0000f72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72D 5464 bytes
SHA-256: 82764ac3b47202e2976860d4a1cf7f4e194e154874d291dbb0747e0f435d2d3f
font_01_sfnt_off000109b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B2 10708 bytes
SHA-256: 182ba78687c84c768fd81dd5727c704d062e1c3fdea6e2ee7b7ac9b23eb4bd4e

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