Malicious PDF — malware analysis report

Static analysis result for SHA-256 567834f3a9be974a…

MALICIOUS

PDF

65.0 KB Created: 2021-02-18 12:51:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0ae4f5a993fa5d6cd2fbd618a35cfd47 SHA-1: 52948cfed4001209bdda706338ac77fdcac92271 SHA-256: 567834f3a9be974ac320a03da3d6a841b706f426690def895dd668de8c99d2d4
166 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful sites. The heuristic 'SE_LOLBIN_RUN_COMMAND' indicates the presence of command execution tokens within the document text, further supporting a malicious intent.

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://baarspo.ru/aws?utm_term=cen+tech+battery+charger+3+in+1+manual PDF link annotation
    • http://evatopshop.xyz/limupimuzafopotexexexuvusl0lk.pdfIn PDF document text
    • https://cdn.sqhk.co/nibijegun/aBiidhe/34830182277.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460708/normal_6011235721a15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479710/normal_5ffebb83f14d8.pdfIn macro / runtime command snippet
    • https://cdn-cms.f-static.net/uploads/4368481/normal_5fd83055396a7.pdfIn PDF document text
    • https://cdn.sqhk.co/kefekawit/jn2vOhe/2342062428.pdfIn PDF document text
    • https://tedajurilazunu.weebly.com/uploads/1/3/0/7/130739962/matibuzet-jejoxawotaj.pdfIn PDF document text
    • https://cdn.sqhk.co/xajamenujo/jiidKhg/desi_calendar_2000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4In macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nijopupeboxisa.epizy.com/tijoveguponewosakewu.pdfIn PDF document text
    • http://guxajez.rf.gd/bicep_curl_machine_form.pdfIn PDF document text
    • http://vabijikabijapul.rf.gd/nigerian_christian_worship_songs_free.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_off0000c03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC03C 5400 bytes
SHA-256: c8399818164e8f5962094ea26ebc7aa5ecc7e2904711327a69a78347601e4bfe
font_01_sfnt_off0000d280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD280 10332 bytes
SHA-256: 3a0c60c51c2f99a04ebbb773096a1697084d3af23055767c6357e14fd3c5b34c

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