Malicious PDF — malware analysis report

Static analysis result for SHA-256 125c0dcfd49f928a…

MALICIOUS

PDF

107.6 KB Created: 2021-03-03 00:47:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 572c4588ea42f82bfa446993c466244b SHA-1: b002800c8d0ac27911c8ba191a94c95032ee9bfd SHA-256: 125c0dcfd49f928a8b524d455652cf03060eb88d430ecdf1d7d3a00d0040e95a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The primary URL observed is 'https://vilenefex.ru/123?utm_term=thought+provoking+meaning+in+telugu', which is likely part of a link farm designed to manipulate search engine results or redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=thought+provoking+meaning+in+telugu PDF link annotation
    • https://cdn.sqhk.co/gupuwiwi/jjamgdZ/67770256793.pdfIn PDF document text
    • https://cdn.sqhk.co/goduwonon/mhbCcjf/39475571470.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwewiwudesi/qhhqJAZ/dead_eyes_lyrics.pdfIn PDF document text
    • http://kaxesurodiwewok.iblogger.org/bayesian_methods_for_hackers_free.pdfIn PDF document text
    • http://pokafujadiso.iblogger.org/the_great_depression_was_a_period_of_class_9_mcq.pdfIn PDF document text
    • https://dozogifelezu.weebly.com/uploads/1/3/4/3/134313369/fedusunofomesas_ganuwani.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/WShi1ih/6189629840.pdfIn PDF document text
    • https://cdn.sqhk.co/sirepajaku/dthi28w/1451187614.pdfIn PDF document text
    • https://wezisaveveto.weebly.com/uploads/1/3/3/9/133999444/tifomejamus.pdfIn PDF document text
    • http://surevixa.22web.org/vadunarorenuni.pdfIn PDF document text
    • https://rawuwivusezorom.weebly.com/uploads/1/3/1/4/131406564/lozepugodudusex-naxapejewotedof-gajuwet-livumerubomo.pdfIn PDF document text
    • https://lupogupep.weebly.com/uploads/1/3/4/4/134444844/4ae2b53.pdfIn PDF document text
    • https://cdn.sqhk.co/fapewejav/86NVjha/reruw.pdfIn PDF document text
    • http://duxojiz.iblogger.org/89981155764.pdfIn PDF document text
    • https://motisodufar.weebly.com/uploads/1/3/5/4/135400919/sadoxej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xowirife.rf.gd/fetabozuleb.pdfIn PDF document text
    • http://bonizeza.epizy.com/curse_of_strahd_maps_for_players.pdfIn PDF document text
    • http://welurolakis.epizy.com/carpophilus_hemipterus.pdfIn PDF document text
    • http://vajapojaperusu.myartsonline.com/what_are_the_innovative_teaching_methods.pdfIn PDF document text
    • http://zowofiz.myartsonline.com/what_were_the_three_colonial_regions_in_early_america.pdfIn PDF document text
    • http://darokajiwebag.rf.gd/dukozuvezikutila.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36A 5012 bytes
SHA-256: f6bac2db274191c37c1b0260e31c98b42eac697702a5a80c579defb68e30043d
font_01_sfnt_off00010449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10449 56728 bytes
SHA-256: 3560abe7ea8c12c679b4e35d4eb16d195d5a0e6ab3635e957dd753f947f80360
font_02_sfnt_off00016bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BC8 10624 bytes
SHA-256: 2bcebe747b849e4d281694a255f3816e8ba99640361b6db75dd3be2a09d6b594
font_03_sfnt_off00018feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FEB 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34