Malicious PDF — malware analysis report

Static analysis result for SHA-256 a066086f26217a2d…

MALICIOUS

PDF

60.3 KB Created: 2020-11-18 21:56:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4de87a0e86e9de6e70e58aeeade35e94 SHA-1: 1e4cb23b82b7266d67056df9bd66a855085c5a2f SHA-256: a066086f26217a2dcca15d745a1617982120e51b5646549eff5f4c02b8cabacc
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized PDF files, suggesting a link farm or phishing lure. The presence of a critical heuristic for PDF_SEO_LINK_FARM and ClamAV detection of Pdf.Phishing.Trojan indicates a malicious intent to redirect users to potentially harmful content. The primary redirector URL is identified as a high-risk indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffnew.ru/123?utm_term=bushnell+neo+ghost+golf+gps PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451567/normal_5f9f701b3e7f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445324/normal_5fb3d50a81cbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386365/normal_5f8ff9c0614e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465147/normal_5fa9fd6ac7a44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422373/normal_5f992a8a2e77a.pdfIn PDF document text
    • https://xizogezoki.weebly.com/uploads/1/3/4/7/134717510/8b419.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/puzuturukofub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d39fff4f-4d9f-45a6-95eb-f6bdfaf60638/34270518040.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f74d7fc6-c46d-4f16-a45b-0d9d71818c55/lampadati_felon_gt_gta_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd4145b2-0d57-4336-a7b8-5315c760dd39/xejetirutape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8164941c-5a4f-4f3a-97d6-8645bc53ed3b/mifivokaxusireliponenix.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/thyroid-s_1000_tablets.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/muxula.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15F 4908 bytes
SHA-256: b95a70a9cc98f1461c54d17f0d52f49debd621638f8f76e46fcd80f27f22c7d3
font_01_sfnt_off0000c222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC222 10204 bytes
SHA-256: c508af02e5d5d3aaef6c1f2ab72c6c2d9eddcb0738f64c83bce2f97e5833851a