Malicious PDF — malware analysis report

Static analysis result for SHA-256 4653261cbd540927…

MALICIOUS

PDF

81.5 KB Created: 2021-02-28 17:18:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 072ea6ae6d60df0e0b57d943a5988c45 SHA-1: a8fbc0e9869f7da6c28877411a3cf469feca2d71 SHA-256: 4653261cbd5409276c5eaec2dac640bf73b8ea1d03573720ce3b5f1ea8004e1b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs suggest an attempt to exploit users through deceptive links, likely for phishing or malware distribution.

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://golowaki.ru/strik?utm_term=multiplayer+video+game+best+ps4+games+2018 PDF link annotation
    • http://madewithsunshine.com/keluguka0zm.pdfIn PDF document text
    • http://wejuzofibab.medianewsonline.com/zavokebakakodepuko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496580/normal_60217ad84a00f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502567/normal_600f4f1078b9d.pdfIn PDF document text
    • http://ketorebagibof.22web.org/dadajejurudelukejutox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470972/normal_602b02d28bf17.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422390/normal_60082d794a130.pdfIn PDF document text
    • http://burrrhey.tech/free_game_capture_software_machznk1.pdfIn PDF document text
    • http://karnaval.host/fisadpvo94.pdfIn PDF document text
    • http://kakafeg.scienceontheweb.net/why_is_my_xfinity_tv_box_blinking_green.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pujumek.myartsonline.com/50887381965.pdfIn PDF document text
    • http://wosolebaxuwutux.rf.gd/zabulajem.pdfIn PDF document text
    • http://gonuwufif.epizy.com/63939719141.pdfIn PDF document text
    • http://gurebuvijo.epizy.com/99813900081.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/kipizibunujavisobiketi.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/goonersguide._com_match_predictions_today.pdfIn PDF document text
    • http://pozonijegexovu.epizy.com/apa_guidelines_spacing_after_period.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_off0000fdf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF7 6196 bytes
SHA-256: d725c6cb5c165bd1dc16c86c809172faf8af200907a5eae1ea805c629e336591
font_01_sfnt_off0001130f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130F 10984 bytes
SHA-256: 2fd57bb93a98fab5895212e960d82a3e84fb6f5063ffce0569d25c11e976be89

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