Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b967b349716d21…

MALICIOUS

PDF

72.4 KB Created: 2021-04-04 21:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 38d57b464afc61b33769381c804e2d3d SHA-1: 96b8798eeea83013075880449130f7e8c4420dd2 SHA-256: d4b967b349716d216bc598219fe0fdc7e086b3393801236478dbb86c8908c19e
156 Risk Score

Malware Insights

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

This PDF document contains numerous external links, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, references 'Nordictrack audiostrider 800 for sale', suggesting a lure to a fake sales page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/aws?utm_term=nordictrack+audiostrider+800+for+sale PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407070/normal_6018532cbb654.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452392/normal_5fd5f59f28dae.pdfIn PDF document text
    • https://cdn.sqhk.co/sukijubese/jbjfLw6/beauty_beholder_meaning_in_urdu.pdfIn PDF document text
    • https://cdn.sqhk.co/wotezowedo/ghgjiaQ/siziza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490371/normal_5fd257dcaeac3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409248/normal_603e59cff315a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446650/normal_6038d333c71c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489045/normal_5feed7337ee9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483071/normal_60251403b381a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490539/normal_60219b2692de3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375887/normal_5fe8ec22cc477.pdfIn PDF document text
    • https://cdn.sqhk.co/juzosugun/0jewjeh/the_ice_cream_parlour_arundel.pdfIn PDF document text
    • https://cdn.sqhk.co/tokititagiwe/dYgdZgj/70333781314.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://37bdae34-bb2f-403f-997c-54a7c09d9c06.filesusr.com/ugd/dc98cc_60e55f05be894c8fa7135656761bd9ae.pdf?index=trueIn PDF document text
    • https://2eeb51df-07ba-4372-80d9-1ef4646fc7f7.filesusr.com/ugd/6af210_5c77ac73610f438eba0879c6ee1fe367.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7A 5384 bytes
SHA-256: c827fb5a0b26b0345260eed13c999ad892fdf300dd02aedad14ea41812f996bc
font_01_sfnt_off0000eddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDC 11284 bytes
SHA-256: a4d355c59b45688746022d7162d3550c613892eafb5c3e76ed7a4dfd793c5dd7

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