Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ccf0f39abe670d…

MALICIOUS

PDF

80.5 KB Created: 2021-02-13 17:05:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 9df89b9b7aff7d9acaacf355608c19cf SHA-1: 66c667f3bcc00d4a9f20de161cb7999d69693a35 SHA-256: 56ccf0f39abe670de618c2a128c503953ba2eeef9f05201952a8d7cc370cfaea
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs and a heuristic indicating it's a link farm on disposable hosting, suggesting an attempt to direct users to malicious sites. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=remote+play+apk+latest+version PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416791/normal_6020401ca6da1.pdfIn PDF document text
    • https://nufewaxitobazat.weebly.com/uploads/1/3/4/7/134748461/bekodobinodeme_jozinafavewuzag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476580/normal_5fd388bf773de.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/hfJhf6Z/311_nyc_apply.pdfIn PDF document text
    • https://katibaluzopoxu.weebly.com/uploads/1/3/0/7/130738884/wufikad-lijapuzepexep-jomoveratisotek-ludanizuxa.pdfIn PDF document text
    • http://gakivako.iblogger.org/zibevojanizaxavafitetidoj.pdfIn PDF document text
    • https://piwaxiru.weebly.com/uploads/1/3/4/8/134882920/nonumikimesalurin.pdfIn PDF document text
    • https://sopaxibifezubin.weebly.com/uploads/1/3/4/6/134608036/wugozamij_pizitetesifemix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486346/normal_5ffd4b5844fc6.pdfIn PDF document text
    • http://xovoposinakok.22web.org/booklet_template_word_mac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446280/normal_5fdebc526b3a8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fumaresaxebikab.epizy.com/povokejepuk.pdfIn PDF document text
    • http://sukasorepej.rf.gd/mulomafejafode.pdfIn PDF document text
    • http://lugumew.epizy.com/tisunofaxusug.pdfIn PDF document text
    • http://zefuxaninegug.epizy.com/58934772681.pdfIn PDF document text
    • http://fobunedofakane.rf.gd/naguvegefobad.pdfIn PDF document text
    • http://mufizepumu.rf.gd/52143320327.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F8 5196 bytes
SHA-256: 1867c3109354ed05f2b2692505c08065219748a4ac261a323b493d377ebbda2c
font_01_sfnt_off0000f7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A1 11816 bytes
SHA-256: 1a245390cb453ac5c2008d447e4a02e4b9de011116f138f001dc4c508a2de4b8
font_02_sfnt_off00011fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE6 16096 bytes
SHA-256: 292b67320f20e7e38814323bff47001ccb55b5eebb397aea8a254f3e91f57b87

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