Malicious PDF — malware analysis report

Static analysis result for SHA-256 af8bf4cc1b09b0ff…

MALICIOUS

PDF

102.0 KB Created: 2020-11-24 12:09:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 40df490149bfb7a9333a9479130d320c SHA-1: c403a8bdcc9394d041fea79e0d95de9dfe6810ec SHA-256: af8bf4cc1b09b0ff171cfe046c2f6094701471dc8de477e10f46bf60bc618074
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent URL pointing to 'trafficel.ru'. This heuristic, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to redirect the user to malicious content.

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://trafficel.ru/strik?utm_term=lonely+planet+tokyo PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366347/normal_5f942cac47e94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459166/normal_5fbc7487a4bbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454811/normal_5fa5333c93a50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449014/normal_5faa02f7541b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481069/normal_5fa6553ac0c8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370785/normal_5f903d44eefbf.pdfIn PDF document text
    • https://jafexilodivoso.weebly.com/uploads/1/3/4/4/134499272/1cdc72e44963ac.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/cb409170.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377938/normal_5f900a73c63c5.pdfIn PDF document text
    • https://tanaxigurav.weebly.com/uploads/1/3/4/2/134266775/5476235.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387586/normal_5f9b251dc519b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/efc62e53-7f41-4c1e-a242-8e61238c194c/espectralismo_musical.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ecc32b9-96c6-4c8e-a820-840ab9c9ff03/10219441985.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_off0001479b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1479B 2944 bytes
SHA-256: 03b8089ed2851b806c2b38158aae1a60135b895a78d7b76c04ac847945363f44
font_01_sfnt_off00015206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15206 4644 bytes
SHA-256: 5e00b387c52e931bf7bfecc100a9b27a1521e6a62153f0ab2400b860f3568581
font_02_sfnt_off000161f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161F7 12232 bytes
SHA-256: d8ee3d2e92c7c8a281403cce914553c547c8142e5edfb9f0be90f2c61ceab058

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