Malicious PDF — malware analysis report

Static analysis result for SHA-256 6466985753ee1cb1…

MALICIOUS

PDF

72.1 KB Created: 2021-02-15 23:24:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8aa20cf650e7c5bce42969870ff621bf SHA-1: 00566d319f2cd4631cd84741707c7520cf2561d7 SHA-256: 6466985753ee1cb12d65d242bd636c712a07849dc7921ed8abe96a02d262a4cd
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a 'troubleshoot a television' lure, which is a common pretext for phishing or malware delivery. The presence of external URIs and the link farm heuristic indicate an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wb?keyword=how%20to%20troubleshoot%20a%20television PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465250/normal_5fd73744cd674.pdfIn PDF document text
    • http://4gusevshop.website/zesevonefitememeso6hfn6.pdfIn PDF document text
    • http://hookup757.fun/2902640630y0p16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488339/normal_60071c7d9f06a.pdfIn PDF document text
    • http://card2card.live/num_lock_caps_lock_indicator6z5rw.pdfIn PDF document text
    • https://xumefuzodagugud.weebly.com/uploads/1/3/1/3/131384373/gapukekib.pdfIn PDF document text
    • https://cdn.sqhk.co/viforoge/blj8ngj/98529198134.pdfIn PDF document text
    • https://cdn.sqhk.co/zifiguwosu/jgj2BTN/6286763063.pdfIn PDF document text
    • https://sebinegovana.weebly.com/uploads/1/3/4/0/134095930/5363529.pdfIn PDF document text
    • http://selectgetc.top/solar_panel_installationttxgr.pdfIn PDF document text
    • https://cdn.sqhk.co/defisepeniba/PMgcRhD/vameso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413846/normal_5ff56a7c70139.pdfIn PDF document text
    • http://academic-club.ru/business_forecasting_wilson_keatingoy65l.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/ultrasound_guided_axillary_brachial_plexus_block.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/hack_wifi_zte_corporation_android.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/anova_sous_vide_cookbook.pdfIn PDF document text
    • http://wuliwopiveti.rf.gd/angadi_theru_hd_movie_song.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/rumuxew.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_off0000dffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFA 5028 bytes
SHA-256: d4a4d5eef14e31489f13fd677e187826129531793a24a940ca798a6beea2a9c6
font_01_sfnt_off0000f11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11A 9972 bytes
SHA-256: 9312c9c311a08cf6e54c2f3f40d0462eee17679c4626d1b7abe8c188f580d619

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