Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d4358a7de5b18e…

MALICIOUS

PDF

72.9 KB Created: 2021-03-27 20:19:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 084836ebcfc244855924afce1d1b2f03 SHA-1: 472f1fe987c55d76846b619f4936d0f57c1b55bb SHA-256: 35d4358a7de5b18eda6eb2778bcbb5b2904fd7c5cc3ecb4c7a1512773850d3d3
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf and includes a lure related to 'Evenflo car seat installation video'. No scripts were extracted, but the presence of numerous external links points to a redirection chain likely leading to malware or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/strik?utm_term=evenflo+car+seat+installation+video PDF link annotation
    • https://cdn.sqhk.co/zokosofu/jjQggNV/language_translator_app_offline_for_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448341/normal_603eaf0dc9eda.pdfIn PDF document text
    • https://xakebugus.weebly.com/uploads/1/3/4/0/134018628/04726dfdb0d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419225/normal_5ff021d048301.pdfIn PDF document text
    • https://divupamafotot.weebly.com/uploads/1/3/0/7/130739309/b8a2d3.pdfIn PDF document text
    • https://widubemevojapo.weebly.com/uploads/1/3/4/3/134320166/92bee.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/KjeChdr/hurst_competition_plus_shifter_2083.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvifilezaja/dveRiff/nutamatal.pdfIn PDF document text
    • https://cdn.sqhk.co/salasereki/uP0jasZ/nupobikafetesevewe.pdfIn PDF document text
    • https://cdn.sqhk.co/rodofusavivi/apipdam/cat_ears_and_tail.pdfIn PDF document text
    • http://bluebadgeform.com/tolatr3ejl.pdfIn PDF document text
    • http://osummer.space/cnet_adobe_reader_windows_7o774k.pdfIn PDF document text
    • https://cdn.sqhk.co/kosojilufut/ihicHJO/33835601638.pdfIn PDF document text
    • https://cdn.sqhk.co/nugopanage/tDwL3jd/sweet_escapes_design_a_bakery_with_puzzle_games.pdfIn PDF document text
    • https://pipudanino.weebly.com/uploads/1/3/4/7/134708560/filisom_kixevipejenaba_zivitikesimej_zemiti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fabupumow.epizy.com/general_information_about_the_vietnam_war.pdfIn PDF document text
    • http://gezewezelatemak.epizy.com/aalborg_sygehus_syd_information.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_off0000e18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18F 5032 bytes
SHA-256: 7d1f60beab912f274fad227a4433d455c6613c50bffeb05411c83dee9e6deaad
font_01_sfnt_off0000f2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C7 10476 bytes
SHA-256: f36b41b6675be7de9a9462ea3e6ad665436c4bce0c482a2d46e4aefb9887cb50

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