Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d0f4bd31b0b86e7…

MALICIOUS

PDF

75.9 KB Created: 2021-04-08 02:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 045d945bd0087eda8130ffdeca20e624 SHA-1: 9c4930facc69b5e8e32d44873af5cb719a11e757 SHA-256: 0d0f4bd31b0b86e704987774183d6428656ccb76efb370e37387dce8da654357
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs suggests an attempt to redirect users to potentially malicious sites, possibly for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/strik?utm_term=maserati+granturismo+convertible+cost
    • http://konifipajig.iblogger.org/aisi_sae_steel_numbering_system.pdf
    • https://cdn.sqhk.co/pamezuravuno/lgdiigf/47871257853.pdf
    • https://cdn.sqhk.co/renapudovi/jb1qPGx/alexa_rank_checker_extension_for_chrome.pdf
    • https://cdn.sqhk.co/merojuniv/5zrnjjj/i_love_crosswords_3_level_20.pdf
    • http://pewodaz.22web.org/fufimerudo.pdf
    • https://ragumavul.weebly.com/uploads/1/3/1/4/131483371/deluj.pdf
    • https://wobomiti.weebly.com/uploads/1/3/4/5/134501920/paguju_nanigas.pdf
    • https://lowutifita.weebly.com/uploads/1/3/4/3/134352456/733271e21a639.pdf
    • https://jipubegu.weebly.com/uploads/1/3/1/0/131070098/sajarikes.pdf
    • https://cdn.sqhk.co/veleviziwew/5gicCig/39139932603.pdf
    • https://gimituwemowi.weebly.com/uploads/1/3/4/8/134872285/7fee5bc6cc13fcb.pdf
    • https://defelidiko.weebly.com/uploads/1/3/1/0/131070982/5126961.pdf
    • https://cdn.sqhk.co/zanivuwiduvo/jbjghec/56955631786.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4ab1e0df-3998-4a34-b7da-b87b1b20d113/does_law_firm_need_to_be_capitalized.pdf
    • http://mulexotuvatago.epizy.com/report_blocked_drain_manchester_city_council.pdf
    • https://uploads.strikinglycdn.com/files/543ab718-6675-46ad-93fa-fcd61a89a78c/defadaxu.pdf
    • http://dexifugufesi.epizy.com/fupusisojirikebuvezulexa.pdf
    • http://fusugesagovovez.rf.gd/51318920670.pdf
    • https://uploads.strikinglycdn.com/files/13e17207-0104-496b-815d-fb2cb5c73ac3/42646107626.pdf
    • https://uploads.strikinglycdn.com/files/5bfe853d-f975-4685-ad1d-78f959b4be21/the_shock_doctrine_the_rise_of_disaster_capitalism.pdf
    • http://tizoxojuragato.epizy.com/historia_da_branca_de_neve.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_off0000e8ef.bin
267bc8ee4d5ae530c0c2cfcd316bde86cf1b950c6fec03eb6a47257d0ff9fc8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EF 5324 bytes
font_01_sfnt_off0000fb0b.bin
af38bf3e3cea805fba1fe0ae734635c04e6e047dd61b0c53978ef724f1362461		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0B 11464 bytes

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