Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4a089f8023c033…

MALICIOUS

PDF

77.9 KB Created: 2021-03-04 09:18:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b1364d38c3277ef16df8a5ce204dc914 SHA-1: 149e3b15d3a3922f1061e2217397198da124e4b5 SHA-256: db4a089f8023c03399340e2a194616d045085bbf818b2350e01588190d568294
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document employs a cloud document impersonation lure, presenting itself as a shared file to trick users into clicking external links. The presence of numerous links, many pointing to disposable domains, and a high ML classifier score indicate a malicious intent, likely for phishing or malware distribution. The ClamAV detection further confirms its malicious nature, flagging it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=hustlers+google+drive+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469841/normal_6017271cc4cfd.pdfIn PDF document text
    • http://delaem-sami.online/56793630506ca6lp.pdfIn PDF document text
    • https://cdn.sqhk.co/lakivasulis/bio38uA/colleges_with_viticulture_and_enology_majors.pdfIn PDF document text
    • http://fotubobuwenapu.scienceontheweb.net/can_you_download_inkscape_on_ipad.pdfIn PDF document text
    • http://vir-tus.com/zigutulowoxejuzipiwekpoop9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492257/normal_5ff9b45653d2a.pdfIn PDF document text
    • http://xoziduso.mypressonline.com/ge_universal_remote_auto_code_search_instructions.pdfIn PDF document text
    • http://raisinslabs.club/philadelphia_inquirer_crossword_puzzle_answers5l54l.pdfIn PDF document text
    • https://cdn.sqhk.co/suvotoruwot/jhT3hdh/spirit_halloween_near_me_phone_number.pdfIn PDF document text
    • http://sifimomikev.sportsontheweb.net/widerukalepoj.pdfIn PDF document text
    • https://cdn.sqhk.co/rejoxapuzopa/idoBgir/2757171372.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/how_much_time_does_it_take_to_learn_tarot_cards.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tigagatu.atwebpages.com/hp_laserjet_pro_m1212nf_mfp_printer_price_in_pakistan.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_off0000f5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E3 5020 bytes
SHA-256: 21c740a35c13fe1e2f95838d005d59ec6fa1fdb8f3f6c2ba26feb9695849bbe1
font_01_sfnt_off00010711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10711 10368 bytes
SHA-256: dc7e3277e0b517635aa24f23c2e75c12c97a30339dbc326c22e4fd7cb3b0b8ff

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