Malicious PDF — malware analysis report

Static analysis result for SHA-256 916cfdb6b5ad9f06…

MALICIOUS

PDF

77.6 KB Created: 2021-05-09 00:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d802e4c26b9cebb7d2e804f6c269a075 SHA-1: 9e1a5c2ecd8af0e028009554ce09644e1fd5a255 SHA-256: 916cfdb6b5ad9f06e4c2cdefdfadaf5e6f33a7f0697292c4dbc9441e217d23f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/strik?utm_term=igloo+mini+fridge+parts PDF link annotation
    • http://xapozekaxo.iblogger.org/37342224907.pdfIn PDF document text
    • http://govuxojikasumot.scienceontheweb.net/21201539850.pdfIn PDF document text
    • https://cdn.sqhk.co/mudonisogub/ajj0Cif/17629641335.pdfIn PDF document text
    • http://vasazuruxu.iblogger.org/foil_transfer_sheets_michaels.pdfIn PDF document text
    • http://mebosopevux.iblogger.org/rajasthan_patrika_bikaner_today.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/LRifgeb/towudopamobotupoguterabu.pdfIn PDF document text
    • http://wuvovewapug.iblogger.org/dersu_uzala_vladimir_arsenyev.pdfIn PDF document text
    • https://cdn.sqhk.co/kibutonap/c5Fxmhc/75730963308.pdfIn PDF document text
    • https://cdn.sqhk.co/tatudawo/Ggegcjg/siren_head_creepy_video_call_challenge_prank.pdfIn PDF document text
    • http://vumoramoguko.22web.org/lujesefezotowikoda.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/vepovax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pefodajisotavuk.rf.gd/scipad_chemistry_level_2_internal_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/gigoxifesegodozuv.pdfIn PDF document text
    • http://mimodiko.epizy.com/afba_hack_apk.pdfIn PDF document text
    • http://nimunofat.epizy.com/blouse_cutting_in_tamil_free.pdfIn PDF document text
    • http://kizosarosuvi.rf.gd/liduwive.pdfIn PDF document text
    • http://murobalebijuge.rf.gd/37303402134.pdfIn PDF document text
    • http://napepezubebefiw.epizy.com/4908889937.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/the_anatomy_of_story_22_steps_to_becoming_a_master_storyteller_free_download.pdfIn PDF document text
    • http://xefoxiwuwoxoja.rf.gd/soil_mechanics_and_foundation_engineering_drive.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_off0000eff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF6 5296 bytes
SHA-256: 8c7759d7e2bdfadce8a0c57027f073720784674409f11a8cc981262a398d561d
font_01_sfnt_off000101e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E8 10932 bytes
SHA-256: b8d6b42217bc2888f323e88fef6a3ef5f1b17eca3a974bd9ca6a4151afe85996

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