Malicious PDF — malware analysis report

Static analysis result for SHA-256 073dc8f72bbb1a7b…

MALICIOUS

PDF

57.1 KB Created: 2020-12-05 08:54:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b78eee50abd3ede7836704db68e52fe7 SHA-1: 748bc97c17cac1eb869de862f544152efed7fa50 SHA-256: 073dc8f72bbb1a7b5f6feb73728d1dea4c0c0f7ed69fd1f7d3754ad57ff978cc
164 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm and an embedded URL, suggesting it is designed to redirect users to external sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links point towards a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafftec.ru/strik?utm_term=omega+masticating+juicer+8006
    • https://cdn-cms.f-static.net/uploads/4393020/normal_5f9565f1b5092.pdf
    • https://cdn-cms.f-static.net/uploads/4481408/normal_5fbbbfed01a19.pdf
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/a1bbc0921170.pdf
    • https://jorosovepi.weebly.com/uploads/1/3/4/7/134706332/3881460.pdf
    • https://static.s123-cdn-static.com/uploads/4491437/normal_5fcb09376a240.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bc921732-4877-4245-b46c-e5943d96fd72/pafav.pdf
    • https://uploads.strikinglycdn.com/files/97ae013b-c87b-4d72-9d13-6bdb1dc3bb06/jakcom_smart_ring_app_for_iphone.pdf
    • https://uploads.strikinglycdn.com/files/22247a72-7272-4baf-a1d8-b0538cc2fe3a/62905796525.pdf
    • https://uploads.strikinglycdn.com/files/480d5a99-713d-41e6-b7e3-933eff3dcafc/regular_ar_verb_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/5ce67494-7cae-42a3-986e-f146cfc0df0f/judegelixekafodajabigup.pdf
    • https://uploads.strikinglycdn.com/files/a93b3e9a-1553-4bca-8079-a9acffc1c8e6/new_york_city_opera_auditions.pdf
    • https://static1.squarespace.com/static/5fc522f4bda9c57a97d9a28d/t/5fc9c4649c93c058c4844322/1607058533893/crowded_color_synonym.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_off0000a629.bin
6585d6630116edf6ab52545677025ece0dde73249a22f8d63e3d86811c390e05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA629 5680 bytes
font_01_sfnt_off0000b95f.bin
d1a3a1f5e26665cbf0692174542b4bb1c72004bb33da192e145608b03bd51c16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB95F 8928 bytes

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