Malicious PDF — malware analysis report

Static analysis result for SHA-256 be05c4c623a49c8d…

MALICIOUS

PDF

87.3 KB Created: 2021-03-15 04:55:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 42d757b2160e1fa0a403296818f424ef SHA-1: 235c747e5632e91d616ef1dc8a131f3f05477ab5 SHA-256: be05c4c623a49c8da2258560f4825aaecf5d5d5da18ed29439b2bc6f6f65e676
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs that redirect to potentially malicious domains, indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the ML classifier's high confidence score. The document body, though heavily obfuscated, references 'myfrenchlab answers chapter 7', suggesting a phishing or scam lure. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/wix?keyword=myfrenchlab+answers+chapter+7 PDF link annotation
    • https://cdn.sqhk.co/tezizejaropu/XxPjdii/new_room_escape_game_secret_escape_moviescaped.pdfIn PDF document text
    • https://nujirami.weebly.com/uploads/1/3/1/3/131384028/568762.pdfIn PDF document text
    • https://kaneloko.weebly.com/uploads/1/3/1/4/131408798/510d7.pdfIn PDF document text
    • https://wobomiti.weebly.com/uploads/1/3/4/5/134501920/45fb0de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461516/normal_5fd3142141da6.pdfIn PDF document text
    • https://cdn.sqhk.co/wazikunal/ggjgdjf/18117018112.pdfIn PDF document text
    • https://cdn.sqhk.co/sezunofubuzi/gicjjgj/sesemafokelur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379486/normal_60186c7dcd3ed.pdfIn PDF document text
    • https://sefusozikoju.weebly.com/uploads/1/3/4/3/134366316/durejifuvi.pdfIn PDF document text
    • http://pazadixokumox.sportsontheweb.net/piranukujawapuj.pdfIn PDF document text
    • https://cdn.sqhk.co/jivomawufem/jjG6Vii/zuzonoxukuzogemivumifomu.pdfIn PDF document text
    • https://cdn.sqhk.co/zevinikiwi/Kiieiix/34295859567.pdfIn PDF document text
    • https://kitopelok.weebly.com/uploads/1/3/4/3/134355781/7897556.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_60119acbb2320.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/xujitezu/xutujimufolalig.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/bihar_katihar_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/kozurelumolax.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/bass_clarinet_jazz_solo_sheet_music.pdfIn PDF document text
    • http://fazovalekotevo.onlinewebshop.net/bulomijasilajirus.pdfIn PDF document text
    • http://femagela.myartsonline.com/99712661027.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/23663461285.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 3936 bytes
SHA-256: ba8d6337663c044a8ae9188d873e335f6d2ef1b4cd796771894e4c730d304020
font_01_sfnt_off0000ff83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF83 5524 bytes
SHA-256: 957545afb277cf389371d2351d6db4583790a165f932d5a11ddaff229f9a2c69
font_02_sfnt_off00011275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11275 11168 bytes
SHA-256: ae46a6ed91d75ccebcb4fc3278e5160223149210b68dc38c3549bd4febd969b4
font_03_sfnt_off000138d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D6 16112 bytes
SHA-256: 230c62125874779aa35677eafb80287b77c8a86841549006e4cf757fee0ef41e

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