Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a22319b3109c36…

MALICIOUS

PDF

74.4 KB Created: 2021-03-17 22:30:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9c6747e0f25cfe0e3929cdfdcbc0669 SHA-1: dba185b07b949acc07d084c052768810ad86e2ce SHA-256: 41a22319b3109c36d231e578bac3dc89dea3b52950c223e5a9f38455f43f5da7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content, likely a phishing page or a download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://mezovuduw.ru/123?utm_term=android+studio+version+control+system
    • https://cdn.sqhk.co/pigujoxexate/gcyKpjb/rorupetizutusuvusozosele.pdf
    • http://gemubanabugawa.mypressonline.com/tafidepuwivoxuf.pdf
    • https://cdn.sqhk.co/napumefu/f8Gaghc/fast_bowling_action_tips.pdf
    • http://mogimetekojubar.scienceontheweb.net/31142404769.pdf
    • http://lusolakidareve.mywebcommunity.org/6883369916.pdf
    • http://xagigusutop.iblogger.org/22636159198.pdf
    • http://usacreditscore.info/what_is_meant_by_a_covalent_bond_how_does_this_bond_hold_two_atoms_togetheralck2.pdf
    • http://reduslimitaly-ufficiale.site/breville_toaster_oven_bov450xl_vs_bov650xl8ee1x.pdf
    • http://lupexovagin.iblogger.org/turaxozativi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lolowavedipugis.rf.gd/gujujuxe.pdf
    • https://s3.amazonaws.com/muxozuvalubi/how_do_you_use_a_keurig_2.0.pdf
    • https://d7e981a8-8c4a-445e-aef0-60d3d4911bd2.filesusr.com/ugd/65d69c_3539c45dd47d4562be0661e94146b654.pdf?index=true
    • http://zijedan.atwebpages.com/how_to_find_fuzzy_lookup_in_excel.pdf
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_92ec59e37692466b82a7cc546dd6d49d.pdf?index=true
    • http://safinemawexow.epizy.com/72981271276.pdf
    • http://jepisaf.epizy.com/free_hand_lettering_worksheets_procreate.pdf
    • https://s3.amazonaws.com/lepefi/54199634802.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e583.bin
6563027bb296b7ac7fe30c27ff344e8206689f39c6c926a3bdc4bcf4da12dab0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE583 5028 bytes
font_01_sfnt_off0000f698.bin
a544ab2677b2ef8b4c94704d8bd3f46108189cd48dc069806894d20e5cbf5c92		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF698 10984 bytes

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