Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b28a2a47f90f71…

MALICIOUS

PDF

69.8 KB Created: 2021-03-03 15:48:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1979de1202495c01925e49aea5e9f401 SHA-1: ccd84c5002bcb63ddf0597d8c8928007e32e3925 SHA-256: 31b28a2a47f90f7173b47fb53a34bcbd2f80b8776e7ee1b557021291c9ddbd41
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and heuristic firings indicating it is a phishing document. The document body, though heavily obfuscated, appears to be a lure related to nutritional information, directing the user to click a link. The presence of multiple disposable domains and link farms further supports a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/strik?utm_term=how+many+carbs+in+arby%2527s+turkey+gyro PDF link annotation
    • http://lebizifijafaxim.medianewsonline.com/mipuwuvanapamowadedakexak.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/jbibibO/85678811355.pdfIn PDF document text
    • http://freshka.fun/rixegefurefejaxofunttnz.pdfIn PDF document text
    • http://banademebilite.sportsontheweb.net/45993123981.pdfIn PDF document text
    • https://cdn.sqhk.co/domonuxasi/Uichj0i/39565560148.pdfIn PDF document text
    • http://it50off.pro/pafininenma88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416125/normal_6005f499e22c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447465/normal_603619cdadde1.pdfIn PDF document text
    • http://helpcopyright-service.com/legendary_gunner_class_mod_borderlands_3y1aom.pdfIn PDF document text
    • http://kawlites.online/temola23ay.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393016/normal_5ffec5092fcb9.pdfIn PDF document text
    • http://abanca-electronica.com/fraikin_group_annual_reporty5uje.pdfIn PDF document text
    • https://cdn.sqhk.co/livatunozasu/gcEgdGA/darksiders_forbidden_lands_review.pdfIn PDF document text
    • https://cdn.sqhk.co/vetedaxuzele/hus6ieJ/popular_knock_down_texture_ceiling.pdfIn PDF document text
    • http://tuwedoviwe.iblogger.org/cyber_security_course_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463560/normal_6015437ea6c75.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dogamesesokuj.rf.gd/2004_dodge_ram_1500_heater_problems.pdfIn PDF document text
    • http://samesesodore.onlinewebshop.net/susiwolet.pdfIn PDF document text
    • http://teporududa.rf.gd/logitech_k400_plus_usb_receiver_driver.pdfIn PDF document text
    • http://vekifaxofezawe.epizy.com/recommendation_letter_for_scholarship_from_employer.pdfIn PDF document text
    • http://lumosaneja.onlinewebshop.net/58248072309.pdfIn PDF document text
    • http://towilisok.epizy.com/baldi_s_basics_mod_maker.pdfIn PDF document text
    • http://risusod.rf.gd/chain_reaction_game.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_off0000d2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F7 5480 bytes
SHA-256: c163f8b18267c55702899521c33e7af49b85f16d473b7fea6ad681a38891b6ad
font_01_sfnt_off0000e5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A3 10492 bytes
SHA-256: dc4c39fe0de927e93615380fe39fec24d937f9121370386ed0ce9be9d8444242

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