Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ebf7ceb7797b96…

MALICIOUS

PDF

75.7 KB Created: 2021-02-08 03:57:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 9746aeb0664551484e06d158b1f22362 SHA-1: 7dec98d28fdc2843bf12f36518a41e914f1b8356 SHA-256: 61ebf7ceb7797b961e6370546c17b20c4a3cb4351de6f516eb232a2b1fbccf96
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of external URIs and the link farm heuristic suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/123?utm_term=call+of+cthulhu+6th+edition+character+sheet+pdf PDF link annotation
    • https://jajibesuwazigix.weebly.com/uploads/1/3/1/3/131383486/kobogegalekuzujejiw.pdfIn PDF document text
    • http://pomurofame.iblogger.org/grammarway_3_answers_scribd.pdfIn PDF document text
    • https://nerapusu.weebly.com/uploads/1/3/1/4/131438180/4498711.pdfIn PDF document text
    • https://faxasuxudoxo.weebly.com/uploads/1/3/2/6/132695360/369532.pdfIn PDF document text
    • http://tumbaa.space/wh_phonics_worksheetsfu7p0.pdfIn PDF document text
    • https://wobosiwax.weebly.com/uploads/1/3/1/6/131607505/palupovap.pdfIn PDF document text
    • https://menanotiji.weebly.com/uploads/1/3/4/3/134322389/vewobosawo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/liwara/substantivos_biformes_e_uniformes_exerccios.pdfIn PDF document text
    • http://nisutenapiri.epizy.com/java_8_64_bit_windows.pdfIn PDF document text
    • http://sevetise.rf.gd/logarithm_antilog_table.pdfIn PDF document text
    • http://vupafigimewex.rf.gd/87547212070.pdfIn PDF document text
    • http://tolimimagag.epizy.com/68368759622.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/70751059580.pdfIn PDF document text
    • http://sokozujetabil.rf.gd/64691860031.pdfIn PDF document text
    • http://wepexivir.epizy.com/futojezimatoneruzuwebu.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/27865226841.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/dudewenorabugux.pdfIn PDF document text
    • http://pojetol.epizy.com/appserv_windows_7_32_bits.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/mitsubishi_ductless_air_conditioner_installation_manual.pdfIn PDF document text
    • http://kekunulu.epizy.com/6100954082.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_off0000e91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91F 5300 bytes
SHA-256: 17bc8c9241e94589c28d1266fc04a73fb45d1a717e12ddc62b96c056d2633bed
font_01_sfnt_off0000fb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1D 11220 bytes
SHA-256: c8bfc445dcf83bac009b1513726aa4bfef235419c9f2f677961456875d0e4f42

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