Malicious PDF — malware analysis report

Static analysis result for SHA-256 84de5b3b279b1e6a…

MALICIOUS

PDF

131.0 KB Created: 2021-04-18 23:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a11cf74a085460ef5deef934f3544dc3 SHA-1: 10cb8027f46ea956ab3e7843b96e932c6f8d610b SHA-256: 84de5b3b279b1e6a26bb9f049e24bc6f9d3822c6ee6307e4d90d345c3c05bf31
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://vilenefex.ru/strik?utm_term=armstrong+ultra+sx+90+furnace+will+not+ignite PDF link annotation
    • http://muzidos.iblogger.org/horn_blow_3gp_video_song_pagalworld.pdfIn PDF document text
    • https://cdn.sqhk.co/tuvameboroke/bhgVogj/fios_tv_one_equipment_cost.pdfIn PDF document text
    • https://tevumusavobe.weebly.com/uploads/1/3/4/1/134108657/308455.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365562/normal_5fff4132d9780.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481663/normal_602110015337e.pdfIn PDF document text
    • https://pudasebedizut.weebly.com/uploads/1/3/4/5/134587980/9321f2b90.pdfIn PDF document text
    • https://cdn.sqhk.co/butofelo/n98oijU/calla_lily_bulbs_over_winter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417992/normal_6027c8cba1af7.pdfIn PDF document text
    • https://lolijejolo.weebly.com/uploads/1/3/4/4/134442146/9221bc.pdfIn PDF document text
    • https://cdn.sqhk.co/pirasemofoge/gjgidji/dubavemijapabaduwewonoro.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/1HjbXRI/pofiguxakefora.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481516/normal_602310b6c44e0.pdfIn PDF document text
    • http://ruwegekugite.22web.org/7561703797.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368977/normal_5ff686089d8b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383801/normal_5ff0dc8d7def4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417817/normal_604defdb162e1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zerozuru.epizy.com/27210860235.pdfIn PDF document text
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_41c764738d5a41629df1c595cb5c94bd.pdf?index=trueIn PDF document text
    • http://joxamemi.epizy.com/meme_template_breaking_news.pdfIn PDF document text
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_58440deaa00a4c7cafbeecbeedd9bab6.pdf?index=trueIn PDF document text
    • http://fadakivok.rf.gd/zotonimagikupugu.pdfIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_3233e1c979154746b6d2f30bff99dba8.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B41E 5528 bytes
SHA-256: d2ca353a899f0c2717e6854c3c99555107a5577603f68ef74bdd13fb53b251da
font_01_sfnt_off0001c6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C6E6 12040 bytes
SHA-256: bb32aa7fdf24bffccebf1483b84b519eba589afc2f9297c091a701ca2d5ef302
font_02_sfnt_off0001efb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EFB3 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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