Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8148d863a0ed8b6…

MALICIOUS

PDF

63.2 KB Created: 2020-12-20 16:34:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: afbf7c8efa89154009fcf9a7864ce054 SHA-1: 4925fd202f83a63c50becff61d1cd0fb8203ca5c SHA-256: f8148d863a0ed8b6a599f1f681a407f3d01bc7f1ccd09f4d762b2817294ceb68
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files, suggesting a link farm or SEO poisoning tactic. One of the embedded URLs, 'https://trafficel.ru/strik?utm_term=airforce+air+rifle+suppressed', is suspicious and likely leads to a phishing or malware distribution site. ClamAV detection and ML classification further support its malicious nature, indicating it's a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=airforce+air+rifle+suppressed PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373749/normal_5f8b10935462c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388825/normal_5fb5552896d13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416128/normal_5f9c4ab860257.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464077/normal_5fb77af254198.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369493/normal_5fcdd7a718dc5.pdfIn PDF document text
    • https://ziripovopibew.weebly.com/uploads/1/3/0/8/130874468/66dd73fc42d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371244/normal_5fad595c9f8d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461773/normal_5fdf55598431b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421329/normal_5fabd53658590.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412396/normal_5fa62e2dcf720.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/3694dc80-bbcf-4868-9c2e-adc2bf51acb6/dufapoxanopikot.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf66fff8cdb769c6db0f75/1606379264429/fubozijimesilizil.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc55349be9b6939512836e1/t/5fd7122c267c8d0ace5e8768/1607930414024/92088740430.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e791985-113b-4d69-8ba3-f2abffe63889/is_the_samsung_galaxy_s8_salt_waterproof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dbbe18c-9abf-4d4d-87e6-28c316214e7b/xasubazodiruji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2ee72dd-0974-4d2b-a6f4-955c10486a95/mawizobokuwafemax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e58fcd1e-a216-4c58-8640-9927838bd831/minecraft_1.7_10_adventure_map_trk.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_off0000ba37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA37 5140 bytes
SHA-256: 5f5a5fdb72061320b1bae7f96f6ea02e30cc027534f3767e539ebb3dbe575ea7
font_01_sfnt_off0000cbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC4 10664 bytes
SHA-256: d9319bb82b62703e3385a0f4c0181c28864cca74904f0eb7761825ee473d8aeb

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