Malicious PDF — malware analysis report

Static analysis result for SHA-256 537f25039288949e…

MALICIOUS

PDF

81.8 KB Created: 2021-05-13 15:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7d77d93dc1cdac054d58cb986dbf496e SHA-1: 8f35b29728ee97581f8d44c1b776712eb310ad91 SHA-256: 537f25039288949eb69fc7fb708982557469effa27d7ddf4bc4c644c0f944317
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains numerous external URIs, including one pointing to 'ponafet.ru', suggesting a redirection to a malicious site. The document body, though heavily obfuscated, contains text related to tattoos and is likely a lure to disguise the malicious intent of directing users to external, potentially harmful, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ponafet.ru/strik?utm_term=small+music+note+tattoo+behind+ear PDF link annotation
    • https://cdn.sqhk.co/sisowufabo/mm7jiLf/crossword_heaven_word_search.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413017/normal_5fde6c96c0d71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452400/normal_60612a0ac9c22.pdfIn PDF document text
    • http://thelait.pro/xesinipolikuvapalosizutus8hpy1.pdfIn PDF document text
    • https://cdn.sqhk.co/nodomepe/ibFgdHU/66513765130.pdfIn PDF document text
    • https://cdn.sqhk.co/vumuwuxa/Tjfiggj/pinoxivurapamefak.pdfIn PDF document text
    • http://liolika-rsya.ru/18736987199yxft1.pdfIn PDF document text
    • https://cdn.sqhk.co/nokikijun/LgeKkAv/89166453813.pdfIn PDF document text
    • http://nafewid.sportsontheweb.net/kawasaki_pneumatic_tools.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369782/normal_60243c26ad078.pdfIn PDF document text
    • http://serururepus.scienceontheweb.net/standard_practice_for_bracing_masonry_walls_under_construction_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469640/normal_6027b32e9a9e2.pdfIn PDF document text
    • https://cdn.sqhk.co/sizafutito/fghidic/modern_wood_chair_legs.pdfIn PDF document text
    • http://craftsmansmetics.com/77528419272i2i9m.pdfIn PDF document text
    • http://idealslimitalia-ufficiale.site/momifefofologozaxazex2rp04.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0748444a-8c53-4f13-93c7-00366c473134/91068309496.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/8488495569.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0006763b-858b-46dc-ab93-1cc6c89d8e67/zixuxororadi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c9d6609-79f9-4a23-b3fd-ae418ca69253/labilowonixagafisagufuko.pdfIn PDF document text
    • http://vobozezojip.onlinewebshop.net/josekepejukur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/297b056b-235e-42b1-87d2-40e082f2db3f/my_favourite_animal_dog_hindi_essay.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/blade_e_soul_revolution_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/mini_crib_sheets_with_name.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52A 5304 bytes
SHA-256: edbac1757a4fb5b99c4f9e5690f9a7431a6e6af4329073ed3cc8936c7e051da4
font_01_sfnt_off000106e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E9 10716 bytes
SHA-256: 67e7fcf2b6f48257f89a224eadde1e8d786ee3c9ddd37646f4eff8e027665ba9
font_02_sfnt_off00012b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B62 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34