Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d148358def44dfa…

MALICIOUS

PDF

66.1 KB Created: 2021-02-04 06:47:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: bf86976842f55c78071f73d60532da21 SHA-1: 73b9b5a2a722063a358aae9e29e3e013990a32af SHA-256: 3d148358def44dfacaa0c725982e4dd93a34e6b05e965ba58888c79cfff08c64
166 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting a phishing or malware distribution scheme. The heuristic 'SE_LOLBIN_RUN_COMMAND' and the presence of multiple external URIs further support the attack pattern of luring users to external sites.

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://maypoin.ru/123?utm_term=fablehaven+pdf+download PDF link annotation
    • http://christinaanddavid2019.com/ginajizeb3b6nz.pdfIn PDF document text
    • http://fabermanufacture.ru/72677071764x87yf.pdfIn PDF document text
    • http://kpupnov.pro/sony_vegas_slideshow_templates_free_download6wc7d.pdfIn PDF document text
    • http://paypallsecurity.com/46934264379kzmem.pdfIn macro / runtime command snippet
    • https://cdn-cms.f-static.net/uploads/4486346/normal_600ec10adf7c7.pdfIn PDF document text
    • http://yourdesk.website/88032649351yqkw5.pdfIn PDF document text
    • http://pubggaming.online/wunidijotekizuxmznmj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388613/normal_6000c60c0d64e.pdfIn PDF document text
    • http://garant-ritual.online/calculus_and_analytic_geometry_by_howard_antonpe94a.pdfIn PDF document text
    • http://verification-help.com/58888065444mn6hr.pdfIn PDF document text
    • http://kpupnov.pro/sony_vegIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kavalukato/tebegigumisesegupo.pdfIn PDF document text
    • http://tosodesuvivat.epizy.com/ancestral_property_act_2005.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/curly_brackets_format_python.pdfIn PDF document text
    • http://virilos.epizy.com/jukidono.pdfIn macro / runtime command snippet
    • http://rodobokojezaga.epizy.com/7201385556.pdfIn PDF document text
    • http://bevamixebigal.epizy.com/audi_a6_2014_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/voxonigupexev.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_off0000c366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC366 5100 bytes
SHA-256: 9a4ddc71894349e341fdc2e065854bed7d4af6ddd9560d5c98831916deccc871
font_01_sfnt_off0000d4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D1 11752 bytes
SHA-256: b4c54fc04dbf9aa767ff03d85074ea55b3d516b17b8b5105d266b37b3db69961

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