Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b38ea7394042bb5…

MALICIOUS

PDF

74.6 KB Created: 2021-02-10 13:05:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 13b12db4a10028eb9181be1ce02c764c SHA-1: 5477370e8175b91f5a542649ba2e8ee26cb9b1c5 SHA-256: 8b38ea7394042bb5d78ec4d5c9960bdcd842175eb77e9ee61e7dd3ccb4d774df
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one pointing to 'jacksth.ru', suggesting a phishing or malware distribution lure. The PDF structure and the presence of external links are consistent with common techniques for delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=bloodhound+gang+-+the+bad+touch+%2528official+video%2529+lyrics PDF link annotation
    • http://clyb-wylcan3.space/pataxolulekibevolcszpo.pdfIn PDF document text
    • http://educationonline.website/ketibetedanipedqior.pdfIn PDF document text
    • http://static-get.top/auditor_s_reportk3cvx.pdfIn PDF document text
    • http://3gusevshop.space/barbershop_2004_castr6x96.pdfIn PDF document text
    • http://trokot-roznica.xyz/vidikovanoxugevabyn6mk.pdfIn PDF document text
    • http://zanartcc.net/peppa_pig_my_birthday_party_and_other_storieswop9l.pdfIn PDF document text
    • http://xonesasa.iblogger.org/56213743960.pdfIn PDF document text
    • http://belldiscount.ru/dwi_nhtsa_manualumhy8.pdfIn PDF document text
    • http://opit.space/osteoporosis_guidelines_philippines01xo5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dolizanawuw.epizy.com/27632261543.pdfIn PDF document text
    • http://jilerixam.epizy.com/pagopowidov.pdfIn PDF document text
    • http://xarifilaf.rf.gd/25092283657.pdfIn PDF document text
    • http://zisuvedo.rf.gd/apology_email_format.pdfIn PDF document text
    • http://zimaroted.rf.gd/cours_de_l_agronomie.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/18444158948.pdfIn PDF document text
    • http://nodafawujanego.rf.gd/kemeg.pdfIn PDF document text
    • http://keporumutiwem.epizy.com/desugewetokomurimo.pdfIn PDF document text
    • http://weralawubuzeg.epizy.com/applied_mathematics_3_information_technology.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_off0000e449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE449 5820 bytes
SHA-256: 3d9c1b836b637589d70a7f42dabd6fbede126522c938365de95967cb5aba11dc
font_01_sfnt_off0000f837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF837 10720 bytes
SHA-256: 7b50eae0a42f0e75dcad079cfba7ef574d41a3a03b4dd659ff97fbe10cf079c1

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