Malicious PDF — malware analysis report

Static analysis result for SHA-256 03c9f1711a280c81…

MALICIOUS

PDF

70.4 KB Created: 2020-11-18 03:59:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 59043af62720310393a3a51d59c18929 SHA-1: 577eb350c6a302d6c084626ed9e3a6b7a8727122 SHA-256: 03c9f1711a280c81f4fb0053f365e419bd178a65b7bccb0900bfde77be0164e0
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with critical heuristics indicating it's a redirector and a link farm. One of the primary links points to known malicious infrastructure, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/123?utm_term=product+of+inertia+formula In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369317/normal_5f99f68ca7413.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/6946222.pdfIn PDF document text
    • https://rofofomigedug.weebly.com/uploads/1/3/4/4/134486696/654cf888.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373259/normal_5f9641068fd8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384642/normal_5f977189d69c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420448/normal_5f9705e9a35a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388046/normal_5f9bfc1b20d97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389805/normal_5f9a0fd28d276.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/lefemijip/jinuratukewa.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/10_business_analyst_performance_goals.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/srs_mutt_mantralayam_phone_number.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/writing_process_prewriting_worksheets.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4AD 4872 bytes
SHA-256: 587049b7c00081f544b3cd413e6543a21aa10784b54248ba6d36a696f733ecf3
font_01_sfnt_off0000c518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC518 10732 bytes
SHA-256: 886818ed77f2bca1295b341f60b63dfb3d9ecc32d878038ed1bc1542fe826285
font_02_sfnt_off0000ea1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1C 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb
font_03_sfnt_off0000fe84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE84 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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