Malicious PDF — malware analysis report

Static analysis result for SHA-256 b040945ee4b297f0…

MALICIOUS

PDF

74.7 KB Created: 2021-03-10 09:37:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0ac626cfb14f9b6ad6b79b5b062d430f SHA-1: bad779622054d5a4a4a072bafb91ccdb51481328 SHA-256: b040945ee4b297f06420fe9de0f9d3e910c56fdf72109262d8e7c279fe832e39
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many pointing to disposable hosting, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', suggesting it was generated by a tool rather than being a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/aws?utm_term=the+colour+of+magic+book+online PDF link annotation
    • http://linodogeb.scienceontheweb.net/10926556916.pdfIn PDF document text
    • http://burivuvuju.medianewsonline.com/oxford_english_english_hindi_dictionary_free_download_for_pc.pdfIn PDF document text
    • http://tegor.xyz/47417528168aiycj.pdfIn PDF document text
    • http://natimivenekixu.22web.org/47350993721.pdfIn PDF document text
    • https://cdn.sqhk.co/sugefixa/ghiiLZ3/bike_race_in_france.pdfIn PDF document text
    • http://lefuvaguvupawax.iblogger.org/agenda_2018_excel_template.pdfIn PDF document text
    • http://krokoboko6.xyz/97300931934dygn9.pdfIn PDF document text
    • http://goropefixujifep.22web.org/bise_multan_11_result_2018_gazette.pdfIn PDF document text
    • http://ranking-se.com/20530403270zio5e.pdfIn PDF document text
    • https://cdn.sqhk.co/gevopobi/jgjbhbv/jukarimabutisufirepobixo.pdfIn PDF document text
    • http://nulivanofika.mygamesonline.org/poulan_pro_pole_saw_pp338pt_parts.pdfIn PDF document text
    • https://cdn.sqhk.co/pujalabasi/pdhewib/wilibo.pdfIn PDF document text
    • http://biniwitovo.mywebcommunity.org/debadamifove.pdfIn PDF document text
    • http://lidlid.xyz/diseccion_del_corazon46nyd.pdfIn PDF document text
    • http://pollsexpert.com/sherlock_holmes_ebook_downloadb4onl.pdfIn PDF document text
    • https://cdn.sqhk.co/tijinujul/ggFJ7bA/planetary_warfare_rts_battle_simulator.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juvadapirepaf.epizy.com/7330773740.pdfIn PDF document text
    • http://dojafeduzig.myartsonline.com/26212831600.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/panasonic_es-la63_manual.pdfIn PDF document text
    • http://rumeponiwogegok.rf.gd/writing_a_thesis_statement_in_apa_formatting.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/puxuvi.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/53832927219.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_off0000e76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76C 5272 bytes
SHA-256: 8d450515185a6a71cca97ccf83de6664a67720ca1a35bfee0d10490ba4185e9d
font_01_sfnt_off0000f92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92D 10688 bytes
SHA-256: 2e5696b76e6488ba308498859a435fadc5fad657991e800623b5933ae77f680c

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