Malicious PDF — malware analysis report

Static analysis result for SHA-256 10371aa0e23f46f0…

MALICIOUS

PDF

74.5 KB Created: 2021-02-25 13:17:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 31cabc2d2c33101f97c99c3f18f921c3 SHA-1: 99c1fad0de23bf50dafde42fc0b1fae36647ac66 SHA-256: 10371aa0e23f46f07677c9fa034fe0f172744643d096a45f3e41ba0ee3e07919
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous embedded links, many pointing to disposable domains and link farms, suggesting a phishing or redirection scheme. The document body, though obfuscated, includes a title related to 'crossfit for beginners', likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://leonvi.ru/strik?utm_term=how+to+get+better+at+crossfit+for+beginners PDF link annotation
    • https://cdn.sqhk.co/vesagivara/vrjfgiW/call_break_offline_card_game_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479904/normal_5fdbb63c006e4.pdfIn PDF document text
    • http://petajofap.22web.org/jajolodar.pdfIn PDF document text
    • https://cdn.sqhk.co/jezofadu/Sjac7ii/notification_ringtone_maker_online.pdfIn PDF document text
    • http://jabilevij.mypressonline.com/79387233497.pdfIn PDF document text
    • http://katipef.medianewsonline.com/what_makes_you_a_good_team_player.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/icggOm6/79177122376.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371523/normal_601e36af32c8e.pdfIn PDF document text
    • https://balolenitazir.weebly.com/uploads/1/3/1/0/131071159/lififapeb.pdfIn PDF document text
    • https://jewesorovusupim.weebly.com/uploads/1/3/6/0/136092124/boxowo.pdfIn PDF document text
    • http://lenuvivureropi.scienceontheweb.net/saying_to_remember_phases_of_the_moon.pdfIn PDF document text
    • http://nepifumawal.22web.org/german_to_english_translation_worksheets.pdfIn PDF document text
    • https://kunokepipadiri.weebly.com/uploads/1/3/3/9/133997431/4628913.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vuroxazejugu.epizy.com/juwitogixusoretazirib.pdfIn PDF document text
    • http://xesujenomudot.epizy.com/minuteman_ambassador_carpet_extractor_manual.pdfIn PDF document text
    • http://petikagemejol.rf.gd/used_at_t_android_phones_for_sale.pdfIn PDF document text
    • http://jowemalawebabe.rf.gd/3739032711.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_off0000e767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE767 5212 bytes
SHA-256: cdef84476b49180b2b6e30f75f3b50be79d7e3279dfa62eb234687b1d645e323
font_01_sfnt_off0000f949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF949 10396 bytes
SHA-256: b80cb191f40a26b449b0e5a8ea6d540b29c6d23bc6afc6568f8d41355b80f9be

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