Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e490d8cb42fc54d…

MALICIOUS

PDF

94.0 KB Created: 2021-04-25 02:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d4bdf111f28b9948e6ae85a56479073f SHA-1: 197b0435cd018c33f875166e2af50a9674053979 SHA-256: 8e490d8cb42fc54ddcef17e22dd3e23867f5c00212220aa401426b9fbbf70cc4
126 Risk Score

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 0.9996

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://ponafet.ru/strik?utm_term=what+is+data+warehousing+and+its+characteristics PDF link annotation
    • https://cdn.sqhk.co/gixelotopa/dlhcjbS/lijozetezoge.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/vP0vUgh/bowetagekurili.pdfIn PDF document text
    • https://cdn.sqhk.co/sadebupunen/ejjhgjf/mikuximuwite.pdfIn PDF document text
    • https://cdn.sqhk.co/buzivafulet/ejbQif2/poxexudokugedojokokape.pdfIn PDF document text
    • https://cdn.sqhk.co/tunuviju/iifhgjh/boston_college_football_camps_2020.pdfIn PDF document text
    • http://ludirobus.getenjoyment.net/gikegurupukebegipe.pdfIn PDF document text
    • https://cdn.sqhk.co/lirotigi/gcTpvjj/3mm_foamex_sheets.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabalero/nN3jjgh/39006691610.pdfIn PDF document text
    • http://mafujewulig.66ghz.com/tolefojavitigisejigawod.pdfIn PDF document text
    • https://cdn.sqhk.co/voxobidivel/cjjjjjd/14200961278.pdfIn PDF document text
    • http://mujoxoluvisukid.getenjoyment.net/5336047876.pdfIn PDF document text
    • http://vakiduweg.mygamesonline.org/47672129985.pdfIn PDF document text
    • https://cdn.sqhk.co/zugeketinog/Lcgj6gf/34802230722.pdfIn PDF document text
    • https://cdn.sqhk.co/vikoparif/BfWhi7B/2468609915.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rawuzogese.rf.gd/creditors_ledger.pdfIn PDF document text
    • http://sufixis.myartsonline.com/bursite_subacromial.pdfIn PDF document text
    • http://kuxexulotubi.epizy.com/deductive_argument_forms.pdfIn PDF document text
    • http://sujidise.epizy.com/angadi_theru_full_movie_tamil.pdfIn PDF document text
    • http://fikovik.epizy.com/xadexovolupalofav.pdfIn PDF document text
    • http://gajutar.onlinewebshop.net/30426496245.pdfIn PDF document text
    • http://kimufigekufeta.rf.gd/63301249829.pdfIn PDF document text
    • http://paravejurozekoj.epizy.com/74983746761.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_off00013283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13283 5276 bytes
SHA-256: 1445dbb8751609214d51f7734ddbc5c4decea7a50e68fe3d8e84ab527bed7f70
font_01_sfnt_off00014481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14481 11288 bytes
SHA-256: f5db9c10bdd6964c8dfed297adb3423537d5e3049ca83ba1754d8bb9576e7496

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