Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d81ba7c80f40d5…

MALICIOUS

PDF

75.8 KB Created: 2021-01-06 04:04:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a6b75424b846e55cb8afc02e5caa1357 SHA-1: 72a0a786aaa1e520fe7e4467b6e8983dc75f53cf SHA-256: 88d81ba7c80f40d535a1359deec427905f6b6c324c2be457a895687f61ef946d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One prominent external URI points to 'https://trafficel.ru/aws?utm_term=acetaminophen+elixir+davis+pdf', suggesting a potential phishing or malicious content delivery vector. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a phishing or trojanized PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/aws?utm_term=acetaminophen+elixir+davis+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426550/normal_5fc1c032dcacb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382770/normal_5f96fbff6ea91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454808/normal_5ff17beb3cd37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379048/normal_5fddf67217270.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424347/normal_5feaec01a950e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411491/normal_5f95dd46e6dd0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387031/normal_5fe0bb822a4d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471711/normal_5fe49a0c07bc3.pdfIn PDF document text
    • https://kepamimap.weebly.com/uploads/1/3/4/6/134609022/samovitevub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381964/normal_5fbac569de11f.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/00ce072a-9e27-4128-a4a8-dd4ab858c8e0/kijupiwinonutapupofepuvo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2290840f-a05c-4922-9c8e-07a4e543fda3/fenomim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/752e7e07-f61f-4eee-bacc-9a7d58700ffe/71817525649.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e88e689-dd66-4c11-b653-78567e79dc3c/zuwofezunefefikatisifelul.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_off0000ebf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF8 5512 bytes
SHA-256: 25165161cc6f4e49086bb0ff950d513b51ed637ac9f037250716240e1602a612
font_01_sfnt_off0000fe9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9A 10688 bytes
SHA-256: 982fcec31c5e43c0408440a2d8e4b4f29039ac5a7adb80e16b03933700a62b91

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