Malicious PDF — malware analysis report

Static analysis result for SHA-256 45817cd8f0084fa9…

MALICIOUS

PDF

79.1 KB Created: 2021-03-22 22:22:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 95a06abd7db4c5e84b4f665cee9b9347 SHA-1: b0baff0ba6930a3dadb5690f4f40a9834c7dbe65 SHA-256: 45817cd8f0084fa93fe5771bf6a01f48bdc21b80581654e05f3ac29745286686
206 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 high likelihood of malicious intent. It contains a large number of external links, forming a link farm hosted on disposable domains, which is a common tactic for SEO poisoning or phishing campaigns. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of numerous external URIs points towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://jumiwimov.ru/wix?keyword=extra+french+episode+9 PDF link annotation
    • http://vuzeliligovitu.iblogger.org/assembly_language_and_computer_organization.pdfIn PDF document text
    • https://cdn.sqhk.co/gubogezemazo/rMhfqJX/lullaby_songs_relaxing_baby_music_mp3_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/duvapegoleva/00RUUpj/dinosaur_world_cave_city_ky_coupons.pdfIn PDF document text
    • http://xulenegutuwovi.iblogger.org/department_exam_answer_key_may_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/MMjaZgf/billie_eilish_wallpapers_hd.pdfIn PDF document text
    • http://fodekofuxuvum.sportsontheweb.net/lexmark_ms310_black_toner_cartridge.pdfIn PDF document text
    • http://gifozuxozud.22web.org/54815799559.pdfIn PDF document text
    • http://zakomuxoza.getenjoyment.net/bixija.pdfIn PDF document text
    • http://gufopitasuwo.22web.org/xolezowopedovuku.pdfIn PDF document text
    • http://gubuxuk.scienceontheweb.net/tipos_de_autolesion.pdfIn PDF document text
    • https://cdn.sqhk.co/bepigulusibe/5LIhjTP/small_business_ideas_list_in_bengali_language.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/hagehhN/56868766042.pdfIn PDF document text
    • http://tepoparupomo.medianewsonline.com/lapuxupaperugegitanatum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jakunivejejaxo.rf.gd/fopazinakorino.pdfIn PDF document text
    • https://6762652a-e869-40f3-960d-1446d4066230.filesusr.com/ugd/55e6b1_bd27c8b246044997961088edc6f66809.pdf?index=trueIn PDF document text
    • https://e5aadbcf-511f-4ee2-989a-4410a22eeed0.filesusr.com/ugd/64930c_9a2b688603f54b12b2dc393b1f5ce6bc.pdf?index=trueIn PDF document text
    • http://sinusisokopex.atwebpages.com/how_to_make_a_rose_flower_arrangement_in_a_vase.pdfIn PDF document text
    • https://a4067306-84c0-45ce-9c36-3cbb795fcb37.filesusr.com/ugd/d5b970_e73c6c065dfe41e9868a58af760e4339.pdf?index=trueIn PDF document text
    • http://mugofunuwutav.epizy.com/jaxawaverisam.pdfIn PDF document text
    • http://jurizamumi.myartsonline.com/fusionner_images_en_logiciel.pdfIn PDF document text
    • http://wufagezigedo.onlinewebshop.net/zujuwefojuzazosil.pdfIn PDF document text
    • http://gelukadusedi.epizy.com/31203028761.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_off0000f4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BE 5392 bytes
SHA-256: 770057c08a4e29f7402ef623e9126591eb6a99f807cc6ba67561b9848abbb18d
font_01_sfnt_off00010719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10719 11912 bytes
SHA-256: 8d0a10a96472d16994813afb20bf078f0f8e80d02dec21ebcce12502ef3f7842