Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cad8e9246afe4ba…

MALICIOUS

PDF

103.7 KB Created: 2021-03-08 05:23:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 66811ccf1292760e8da94783c5f14bc4 SHA-1: bf6726831f4bcaf5c4c4f82f19effce1453775f5 SHA-256: 6cad8e9246afe4ba09840f2f2e80927ca2e071f9f8cee3ef6a575e3c3ccf9960
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external links, many pointing to disposable hosting. The document body, though heavily obfuscated, contains keywords related to 'bayesian data analysis' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious nature of the links. The primary attack pattern appears to be SEO manipulation or phishing through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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 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.
  • 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://kuzutuzo.ru/wix?keyword=kruschke+doing+bayesian+data+analysis+pdf PDF link annotation
    • https://wolunogejafijut.weebly.com/uploads/1/3/4/6/134649672/lozidunesotiwigumope.pdfIn PDF document text
    • https://cdn.sqhk.co/fogibadeku/fibwoZW/52796619707.pdfIn PDF document text
    • https://wudatoguji.weebly.com/uploads/1/3/4/8/134885495/dobinalejibeje-megojewexatup-bogeni.pdfIn PDF document text
    • https://cdn.sqhk.co/tirewaku/Agcvgj3/13432726320.pdfIn PDF document text
    • http://yazansoft.com/codecombat_answers_backwoods_forestpktgv.pdfIn PDF document text
    • https://xewidepomizexas.weebly.com/uploads/1/3/0/7/130775014/vexetuguwo_lefagefijowex_raguludole_rizarozetuxixa.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/Stwibjf/wordpress_hosting_cost_comparison.pdfIn PDF document text
    • http://mmeueue.space/beautiful_flower_house_images7pcvf.pdfIn PDF document text
    • https://cdn.sqhk.co/rifusofuwedi/epiaWKY/wood_christmas_cutouts_yard.pdfIn PDF document text
    • https://kitejunozog.weebly.com/uploads/1/3/4/3/134319277/nelewodinin.pdfIn PDF document text
    • https://vukojudal.weebly.com/uploads/1/3/5/3/135317211/2c38682d856880.pdfIn PDF document text
    • http://xtreme-sport.ru/sea_of_thieves_guide_shroudbreakertipjc.pdfIn PDF document text
    • http://detonic-de.website/1942702711cmniy.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/UjeE9z3/saduxor.pdfIn PDF document text
    • http://prizinsta365.website/fukapa2rh0e.pdfIn PDF document text
    • http://reflectionss.space/letra_del_himno_nacional_mexicano_en_lengua_nahuatlossoe.pdfIn PDF document text
    • http://fito4ka.xyz/12333680658fhr6b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://33edd578-4186-4695-89f3-f56a5a23fc53.filesusr.com/ugd/f17c08_25d162bcfb104a6c8527f3d02af041ae.pdf?index=trueIn PDF document text
    • https://a0a5ada1-270c-452f-b092-d943fc6f0dc0.filesusr.com/ugd/306762_631349e52e94476a9834541c6271791a.pdf?index=trueIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_65617605e64c4041acb16be63229d2ae.pdf?index=trueIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_7283736128de463698739d68ee2fba0f.pdf?index=trueIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_bd8d1c30edab4f36a378a0b0322123b6.pdf?index=trueIn PDF document text
    • https://4c2674ec-1430-4cec-a455-d6a35d10586e.filesusr.com/ugd/38955b_026dc93d8a634eeb8886bc6aef67aa19.pdf?index=trueIn PDF document text
    • https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_e5ec363c0fbd41daa573eed913c35cdd.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000125d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D7 12040 bytes
SHA-256: 03cd21218a86c20c3c7704b52a3dcd40ef6910972286a9d079973761364316ed
font_01_sfnt_off00014d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D60 5692 bytes
SHA-256: 4a18f74de1ec9a05ee3a5d22e872e47c8d4e7a30c8cbeeca84034295d5fd1525
font_02_sfnt_off000160c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160C3 15148 bytes
SHA-256: 76709299096f6e765d571ab935472e32e61976cda568fb2502e4c01737f17657

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