Malicious PDF — malware analysis report

Static analysis result for SHA-256 852c9a8360d0b4a5…

MALICIOUS

PDF

82.2 KB Created: 2021-05-10 20:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 87b64316107c3c8fc6d53ddd8d3a98e3 SHA-1: 2e8847eca0c8bc8b5dd6b5ff06a6bf2062d2b3ba SHA-256: 852c9a8360d0b4a52883643df0cf2fdf1a567ded927756124661b34029914bfa
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, a common tactic for phishing and SEO spam. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a mass external PDF link farm, suggesting the document's primary purpose is to redirect users to potentially malicious or deceptive websites. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://seumenha.ru/strik?utm_term=what+is+the+plot+of+the+raisin+in+the+sun PDF link annotation
    • https://jawuwokobot.weebly.com/uploads/1/3/1/3/131381435/madamuriduwosop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374188/normal_6058a14770808.pdfIn PDF document text
    • https://pezasagizagifoj.weebly.com/uploads/1/3/5/9/135968908/zabapugux.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/PjbiigL/44998243453.pdfIn PDF document text
    • https://toroxamaje.weebly.com/uploads/1/3/4/0/134017611/670af07.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464082/normal_600817d3c3192.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485296/normal_5fcef638d725e.pdfIn PDF document text
    • https://zoroxazug.weebly.com/uploads/1/3/4/6/134614170/8390443.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367667/normal_6046997a4a95f.pdfIn PDF document text
    • https://cdn.sqhk.co/niwexifa/hzichjg/wokad.pdfIn PDF document text
    • https://wajupera.weebly.com/uploads/1/3/4/7/134763514/wesevoxota.pdfIn PDF document text
    • https://menanolunum.weebly.com/uploads/1/3/4/7/134754058/pajij-xijelejulopof-javipomazobo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://327bbe42-9aa5-4ca0-80e5-6c9857058a26.filesusr.com/ugd/2b870b_a24b38fa4a94440194e6bbbdb185d8ec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/loneminovu/33121110310.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/pimakopef.pdfIn PDF document text
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_06bc3160ea0048488878144096ccacf0.pdf?index=trueIn PDF document text
    • https://05282879-aed3-4f16-ac14-d534add4d4bd.filesusr.com/ugd/0f8b7c_d60689ddeab74540bd6619b0e194c6ca.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/free_coloring_sheets_halloween.pdfIn PDF document text
    • https://cfc603e6-7cd4-4c42-812b-9722deb80ae4.filesusr.com/ugd/0e9fc2_3e2d9de2617a4ecf8129534f0f66dc44.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/resumen_de_romeo_y_julieta_por_capitulos.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/47640539900.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82E 4884 bytes
SHA-256: 07c2952cc3e8646e51e65aa12e15123a138ccd5b5aacbed342c44dd454184e3f
font_01_sfnt_off000108cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CD 10632 bytes
SHA-256: d28fba66c6b6a7b9f0275eff412eb87cef44fd7809901dd7e5036508ca74544a
font_02_sfnt_off00012d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3C 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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