Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1548efbadbae127…

MALICIOUS

PDF

82.1 KB Created: 2021-03-09 20:06:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e2018227a793f61b91d75e6d206bd270 SHA-1: 78d55ba6ba41561f9a7dd98634f6f106769a3cc9 SHA-256: c1548efbadbae127ba700e04cdc35ee4bdc8d2b4efcc1661780f0626170facba
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing attempt. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, which can be used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://bologen.ru/123?utm_term=rauf+faik+childhood+song+mp4 PDF link annotation
    • http://kitafoged.medianewsonline.com/57649741342.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/43920818748.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408858/normal_600e97d505fc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494417/normal_5fd6c7e8594f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465545/normal_6014c49cb701c.pdfIn PDF document text
    • http://kirudikegopoded.sportsontheweb.net/jbl_boombox_vs_xtreme_2_specs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366341/normal_60083132416ba.pdfIn PDF document text
    • http://jikusoxet.iblogger.org/cards_against_humanity_appropriate_age.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/optimate_4_charger.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443576/normal_60327977c127e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411919/normal_6001d5cb6635d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495271/normal_5fc83e56b9b40.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/27364358529.pdfIn PDF document text
    • http://kojurebajalafaw.22web.org/59993803694.pdfIn PDF document text
    • http://gizovivomiz.getenjoyment.net/76264649254.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385230/normal_5fec1e31576cc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vutelubuvobu.rf.gd/6th_grade_figurative_language_powerpoint.pdfIn PDF document text
    • http://pebomotixot.myartsonline.com/how_to_write_my_professional_accomplishments.pdfIn PDF document text
    • http://rakemexovujepez.epizy.com/kantar_omnichannel_report.pdfIn PDF document text
    • http://robabaxagolelez.rf.gd/vector_analysis_by_schaum_series_solution_manual_slideshare.pdfIn PDF document text
    • http://latowetutut.epizy.com/what_does_best_wishes_mean_in_an_email.pdfIn PDF document text
    • http://sebokegekesuded.atwebpages.com/how_long_after_exercising_do_you_start_to_see_results.pdfIn PDF document text
    • http://xoxalufuropa.epizy.com/nevifuzise.pdfIn PDF document text
    • http://zetesapoxus.epizy.com/comparacion_entre_ciencias_formales_y_empiricas.pdfIn PDF document text
    • http://levewome.epizy.com/leralal.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_off0000d1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AD 5632 bytes
SHA-256: 1afe974d5da18e4d2120862acf6329ad998faa7e9130979804c3bd962785df26
font_01_sfnt_off0000e4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C6 2128 bytes
SHA-256: 18f47e14b033b9868918b882439b75cbf81e22a18dc542528a66a0b8b339fdc8
font_02_sfnt_off0000ee96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE96 12484 bytes
SHA-256: aa7920836b01739ad135dfb1004b6d82315efa4830597863bc93a95dc9fe8287
font_03_sfnt_off000117a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A9 20020 bytes
SHA-256: 5a82858b3ed9a893436768dd504524bfd1f267baf13b347de6824e72135a3399