Malicious PDF — malware analysis report

Static analysis result for SHA-256 78789d72ed45139f…

MALICIOUS

PDF

89.9 KB Created: 2021-03-22 05:19:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 963295536302c1f5aab00537e89aba95 SHA-1: a3aaa5c515cef4671ff1089d23abfd5ca26446e5 SHA-256: 78789d72ed45139faef1e2ef8a87f9fff21e349561ee5e42484f9efbb0dbe882
156 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or redirection mechanism designed to obscure the ultimate destination. One of the embedded URIs, 'https://leonvi.ru/wix?keyword=career+assessment+worksheet+for+high+school+students', appears to be a lure, while many other links point to potentially malicious content or further obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/wix?keyword=career+assessment+worksheet+for+high+school+students
    • https://cdn.sqhk.co/pulununese/hdldn83/zombie_slayer_pantheon_rarity.pdf
    • http://nageramuvepom.mywebcommunity.org/12569879923.pdf
    • https://cdn-cms.f-static.net/uploads/4384649/normal_600a28b19c65c.pdf
    • https://ponadolofulofuk.weebly.com/uploads/1/3/1/3/131398561/xigas-sesufipenej.pdf
    • https://cdn-cms.f-static.net/uploads/4419206/normal_601813ae8d1ae.pdf
    • https://cdn.sqhk.co/wadusazilox/chedxia/rc_nitro_t_maxx_fuel_tank.pdf
    • https://sarajigirokoxi.weebly.com/uploads/1/3/5/3/135300612/0355f1273d1c105.pdf
    • https://cdn-cms.f-static.net/uploads/4476301/normal_601dadbd34fd7.pdf
    • https://cdn.sqhk.co/vomawoko/hbhgStZ/jazz_free_internet_offer_code_2020.pdf
    • http://lobulezinovux.medianewsonline.com/wheat_belly_recipes.pdf
    • https://lojizeli.weebly.com/uploads/1/3/3/9/133997115/ragelutonatabuz.pdf
    • https://static.s123-cdn-static.com/uploads/4416932/normal_5fefcd1b8b7c4.pdf
    • http://viwoxufegoger.sportsontheweb.net/32214962974.pdf
    • https://cdn-cms.f-static.net/uploads/4496605/normal_60514e44b8585.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ziwuvijevo/pink_floyd_allmusic_guide.pdf
    • http://mipagolawalixa.onlinewebshop.net/81018288281.pdf
    • https://s3.amazonaws.com/negonanopix/93747632247.pdf
    • https://s3.amazonaws.com/kigavanus/87718206923.pdf
    • https://s3.amazonaws.com/gixirojozogufux/ragalixevibugatutowezuwuz.pdf
    • https://s3.amazonaws.com/mozedijiz/ximezagizemagusix.pdf
    • https://s3.amazonaws.com/sorogamat/acrylic_sheet_common_uses.pdf
    • https://s3.amazonaws.com/kufazete/does_a_bill_of_sale_have_to_be_notarized_in_texas.pdf
    • https://s3.amazonaws.com/livivuvuwugeb/jixuzo.pdf
    • https://s3.amazonaws.com/saziwijaxodav/lajinulumekokezegapelop.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000120ea.bin
9beb279e8812dd5f546133f16987077da8a37d64b5a72e0be3101dc607fa14f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120EA 5496 bytes
font_01_sfnt_off00013387.bin
2ef919ded8f6cfa94fb6ac4299dd472a34dcbef982beda5642444b42e05149cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13387 11428 bytes

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