Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ac77073710b6cd…

MALICIOUS

PDF

77.2 KB Created: 2021-03-27 10:53:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 812dea0009d8db1898cea204f4500e9f SHA-1: 515331f08edca87b53a04ce6a7bddb38662f91b7 SHA-256: c9ac77073710b6cdab187084ca08ba9168cd51f26aa482c04064e12597b998a9
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a PDF link farm. It contains numerous external URIs, with the primary one being 'https://kuzutuzo.ru/strik?utm_term=best+pressure+cooker+and+air+fryer+2019'. The PDF structure and embedded links suggest an attempt to redirect users to potentially malicious websites, aligning with phishing or malware distribution tactics.

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://kuzutuzo.ru/strik?utm_term=best+pressure+cooker+and+air+fryer+2019
    • https://cdn.sqhk.co/lanumakefu/hdjdjdx/e_news_new_schedule.pdf
    • http://kuvenumine.mygamesonline.org/zajikonoxonemiwagolep.pdf
    • http://buzevuzelape.mywebcommunity.org/niwegiguf.pdf
    • https://cdn.sqhk.co/vivokunavu/jjNDGI3/fovokaratisolivoz.pdf
    • http://instapodarok.site/52556888109ojxet.pdf
    • https://cdn.sqhk.co/naxupowu/jzjbigd/segesububuduloniwivelo.pdf
    • https://mobesometug.weebly.com/uploads/1/3/4/6/134644263/mesed.pdf
    • https://cdn.sqhk.co/bexefoboxevi/imgcv1n/26534714250.pdf
    • http://vowuzemiru.medianewsonline.com/panuziluwixukajaposov.pdf
    • https://nanoxoxudotu.weebly.com/uploads/1/3/0/8/130814682/6442715.pdf
    • http://govnosiakxws.online/what_is_not_a_capital_budgeting_decisionhoy50.pdf
    • http://hempmap.ru/marvel_super_heroes_adventure_game_sagau9cgz.pdf
    • https://cdn.sqhk.co/nobixapo/hcihdid/55996306108.pdf
    • http://hookup153.online/xuwitujoruzabi1go0w.pdf
    • https://cdn.sqhk.co/mixaluwekitu/bxjdhe9/teacup_pigs_as_pets_pros_and_cons.pdf
    • http://sufawevugut.mywebcommunity.org/85063879298.pdf
    • http://astropsychology.website/disowimusejifenipewumfdg96.pdf
    • http://xajabuzowa.scienceontheweb.net/84086813460.pdf
    • https://cdn.sqhk.co/nuvowiraxuf/gjhi0ib/1552263168.pdf
    • https://joginogi.weebly.com/uploads/1/3/1/1/131163620/f0370a15a924.pdf
    • https://cdn.sqhk.co/pajubopolak/doshaUm/word_crossy_level_6585.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ropidadegaxut/volumes_of_pyramids_and_cones_worksheet.pdf
    • https://s3.amazonaws.com/pibajuwi/85882548891.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_off0000ec6b.bin
ec55403b1ccfe9b0f717a2a0c6d86cd7a6d58166428184a1407953ae9754fa68		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6B 5812 bytes
font_01_sfnt_off0001005f.bin
bfc718b2f78cb8b23f780ca214d0c489571dbc46e634332ea774e5e388f1bf25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1005F 11316 bytes

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