Malicious PDF — malware analysis report

Static analysis result for SHA-256 74845e4affc02d1f…

MALICIOUS

PDF

85.9 KB Created: 2021-03-04 22:16:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e82ed0509cdd9e8b61ad01192b0062e0 SHA-1: 3daf431d7fd287f2940839efcd06fe4523d35615 SHA-256: 74845e4affc02d1f9ea5d6c51a17792a007c2cd4faa84a2726a9adc413f6386d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as a link farm and contains a high number of external URLs, indicating a phishing or SEO manipulation attempt. The ClamAV detection and ML classifier further support its malicious nature. The document body is heavily obfuscated and unreadable, but the presence of numerous links suggests the primary goal is to redirect users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • 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/award?keyword=where+can+i+throw+old+clothes PDF link annotation
    • https://katozela.weebly.com/uploads/1/3/0/8/130874493/20127fbc6373392.pdfIn PDF document text
    • http://vostokzapad.su/18160154181rdfsn.pdfIn PDF document text
    • https://wetikifavuzimol.weebly.com/uploads/1/3/1/6/131606122/xokasanapapa_xunonutome.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/E0ugcjb/radio_spazio_104._7_fm_en_vivo.pdfIn PDF document text
    • https://fuwiposodunumof.weebly.com/uploads/1/3/1/4/131438128/zojiburenuw_kewekopipab.pdfIn PDF document text
    • https://cdn.sqhk.co/kosadara/e9L1sha/nileren.pdfIn PDF document text
    • https://xuvunigito.weebly.com/uploads/1/3/1/1/131164310/1156614.pdfIn PDF document text
    • https://cdn.sqhk.co/pakelabete/ieIdr5I/xunukuniseneganoru.pdfIn PDF document text
    • https://dusuwepi.weebly.com/uploads/1/3/4/5/134589125/mudeba.pdfIn PDF document text
    • https://jowatewiko.weebly.com/uploads/1/3/1/3/131380225/759946.pdfIn PDF document text
    • https://nitikado.weebly.com/uploads/1/3/4/6/134660078/jazikevesa.pdfIn PDF document text
    • https://menekagamop.weebly.com/uploads/1/3/4/0/134097565/129018.pdfIn PDF document text
    • https://lodipopigib.weebly.com/uploads/1/3/1/8/131857338/b83370f2d5b.pdfIn PDF document text
    • https://cdn.sqhk.co/gugirejol/vhedMjj/history_of_hinduism_in_america.pdfIn PDF document text
    • https://cdn.sqhk.co/kigoxeni/ianGgiW/color_bump_blocks_3d_apk_download_uptodown.pdfIn PDF document text
    • http://arevakar-travel.com/pulmo_aide_5610d_manual9fbgb.pdfIn PDF document text
    • https://wilulesutazi.weebly.com/uploads/1/3/3/9/133997377/debigikubakebopojo.pdfIn PDF document text
    • http://claire-irk.ru/how_to_measure_ratio_for_hair_dyezt49z.pdfIn PDF document text
    • https://cdn.sqhk.co/rabovafom/Chgwyke/nonton_cooking_master_boy_episode_10_sub_indo.pdfIn PDF document text
    • https://cdn.sqhk.co/totimujid/Hjj7jhm/95110276258.pdfIn PDF document text
    • http://prognoz-football.club/what_does_the_word_contempt_meanlebj0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d265e39d-d235-470d-baf2-640d408315b5/why_has_my_tp_link_stopped_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecc6d81d-86b5-49aa-99d9-95976b971e28/girivinivobosipeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02f0d33f-987a-4e4d-a716-bac7d8e69920/tubixo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f857d2bf-4522-4627-ae7d-ff65e5aecf59/44397674509.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67b94bbf-05c6-48b3-b13e-431c75d44c16/never_eat_alone_chapter_summary.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_off00010887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10887 5132 bytes
SHA-256: 4869d00b29b8d43f625bea7abf01be04eb8826dfb18c781cf79743aecf47fbec
font_01_sfnt_off00011a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0D 15564 bytes
SHA-256: e1a429cb2c3cb5d84475b3398ca43df0c4c39a9e0238a743c52533e8ceeb4f3a

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