Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb0b6d4466d2ba7…

MALICIOUS

PDF

90.1 KB Created: 2021-02-23 16:47:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 17f52ad37fc9b82d18a2081a1ebf7b73 SHA-1: 3ceecaad036e3e0c987fa4ccdb6ee0f37393b276 SHA-256: 4bb0b6d4466d2ba7365f988b5df21139e1f32322f6929cb3ba57d34e9e5479cb
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious content. It contains numerous embedded URLs, with one prominent URL pointing to a phishing site disguised as a guide for building mobile apps. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm on disposable hosting, further supporting the phishing attempt. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://crophysi.ru/strik?utm_term=how+to+build+a+mobile+app+for+beginners PDF link annotation
    • https://cdn.sqhk.co/ratobomebal/rZO1ih8/49326001751.pdfIn PDF document text
    • http://bilet-pdd.site/washington_state_homeschooling_programs8c9sb.pdfIn PDF document text
    • https://mogarujatokeduw.weebly.com/uploads/1/3/5/3/135324664/bajewome_numik_pojeke.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/ahgRaBS/strikemaster_solo_ice_auger_parts.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xegewir.epizy.com/vakolefiw.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/uxpin_web_design_trends_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/aerodrome_manual_meaning.pdfIn PDF document text
    • http://jitimixilu.epizy.com/converse_plataforma_altas_blancas_piel.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/danovuzolaliniwufupof.pdfIn PDF document text
    • http://sogigadataga.epizy.com/mijexuxixekaviwuj.pdfIn PDF document text
    • http://vogojitipam.epizy.com/at_t_tv_guide_florida.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_off00010b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B37 5552 bytes
SHA-256: ae327b43cc5ab98d0ffa55125d4749e84736d4eb94f333333d48ebfd5ca279a1
font_01_sfnt_off00011e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E11 11128 bytes
SHA-256: 6a407a52656acd70dc1ead7c9fe127a62888c99844a46d7ab1ffc5e6caa3e08d
font_02_sfnt_off00014420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14420 16684 bytes
SHA-256: f40757642555d2ee4764e5875fdff37c1b531e6b8553217ef1bb56490712595b

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