Malicious PDF — malware analysis report

Static analysis result for SHA-256 025c3d3f2da77384…

MALICIOUS

PDF

72.7 KB Created: 2021-02-15 23:50:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d64663fa0999d8f156f043ad1ad54b32 SHA-1: 25ab9f9a0ebd5acb942f4fd6a6c894013da7d75d SHA-256: 025c3d3f2da773843832c20cff989a15a06d66e174bc8c2dfa9d70d5e45067e2
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to be a lure related to software functionality, likely to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=how+to+change+3d+view+to+2d+in+autocad+2020 PDF link annotation
    • https://cdn.sqhk.co/potebuso/HhjcgeX/83034819130.pdfIn PDF document text
    • https://xozowozorero.weebly.com/uploads/1/3/2/6/132695390/4777538.pdfIn PDF document text
    • https://cdn.sqhk.co/pewowutefiw/sxhhQPt/nafitadaxepute.pdfIn PDF document text
    • https://vidajubobulixi.weebly.com/uploads/1/3/4/6/134650234/4469744.pdfIn PDF document text
    • https://cdn.sqhk.co/vovusupa/jgiahfh/livogoputaz.pdfIn PDF document text
    • https://cdn.sqhk.co/zibusisujij/RZBpyHS/42406441643.pdfIn PDF document text
    • http://bigchance.pw/vobomujukulawavofelijub7pgcz.pdfIn PDF document text
    • https://cdn.sqhk.co/bajafigotuvi/iESF9TK/31416220636.pdfIn PDF document text
    • https://cdn.sqhk.co/gitaligido/kijBjaJ/51828405190.pdfIn PDF document text
    • https://cdn.sqhk.co/jiloduvunilu/SCjidje/83084540081.pdfIn PDF document text
    • https://cdn.sqhk.co/jonilinenuvo/jiJcX1k/african_braiding_salon_las_vegas.pdfIn PDF document text
    • https://wemovimezatura.weebly.com/uploads/1/3/4/6/134611727/3936062.pdfIn PDF document text
    • https://pipamoximiketo.weebly.com/uploads/1/3/0/9/130969724/f20cfe.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/xgiEyb2/rally_runner_endless_racing_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nupopagiwagivu.epizy.com/inverse_functions_worksheet.pdfIn PDF document text
    • http://medesawawolujim.epizy.com/ullathai_allitha_songs_isaimini.pdfIn PDF document text
    • http://woxenebifa.rf.gd/12301601991.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_off0000db4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4C 5448 bytes
SHA-256: eb399021b3c55230973ea3d9376ff541f71f226e8d9500501931f6c53eb980f3
font_01_sfnt_off0000edef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEF 11440 bytes
SHA-256: 3e7cb273e309b61b1ea55579f40c7b96bd70723d3af08cf9c8ca1a3d43d775a7

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