Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d2cf3ecda1629c…

MALICIOUS

PDF

121.8 KB Created: 2021-03-01 10:16:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d0aa6728080f2ee05b079671d241f267 SHA-1: f5cbafd58e765fb036114f7dcad57664542c4291 SHA-256: 16d2cf3ecda1629c917433fa3f4a9eff2ceb87f96ecc365eff3f2b9dc2d26b88
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to potentially malicious domains, identified by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. The document body, though heavily obfuscated, contains fragments suggesting a lure related to charging a jump starter, which is likely a pretext to drive users to the provided malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/aws?utm_term=how+to+charge+duralast+jump+starter+600 PDF link annotation
    • https://fuwurobo.weebly.com/uploads/1/3/0/8/130814642/pebomifigoxesos.pdfIn PDF document text
    • http://tk-pobeda.site/sonic_menu_specials_burger_and_onion_ringsg1cnh.pdfIn PDF document text
    • https://fawurefo.weebly.com/uploads/1/3/4/4/134441885/14decf3df.pdfIn PDF document text
    • http://amaryllis.space/xijuvakezifubima3buyl.pdfIn PDF document text
    • http://verification-help.com/new_super_mario_bros_wii_2_the_next_levels_download_riivolutionudnne.pdfIn PDF document text
    • https://cdn.sqhk.co/vixawutozama/jcNN2B4/9674693158.pdfIn PDF document text
    • http://leomannapov.com/why_is_my_bluetooth_mouse_not_connecting_to_my_mac2g21e.pdfIn PDF document text
    • https://cdn.sqhk.co/lewulula/ijjjhgL/gang_war_mafia_mod_apk_download.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/nopomewegobij/home_choice_catalogue_august_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/nidipo.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/votolapifonixazobule.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_off00019bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BF0 5912 bytes
SHA-256: be4dd899b6350d3c5283c2f8c9b85d1e3ff7148b33c73b477380a4a4c4a319a7
font_01_sfnt_off0001aff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFF8 12736 bytes
SHA-256: 3a5c63c5395ec125ec8a04a9a24492df92210248e872a62591d70189129fb5ee

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