Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f906437bf8b9a02…

MALICIOUS

PDF

72.2 KB Created: 2020-11-17 00:04:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 5d12be85aa9b9f5717dd1de5180c8182 SHA-1: 917089c17172163a61f23d2f330b53016941a244 SHA-256: 6f906437bf8b9a026630dba13615876ae0659da5951389fab53a2c42f021effa
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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://cctraff.ru/123?utm_term=rail+vs+road+cost+per+mile In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370543/normal_5f8874fa58802.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383924/normal_5f8eebe1963e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428033/normal_5f9e6b76208a6.pdfIn PDF document text
    • https://leziwave.weebly.com/uploads/1/3/4/4/134446015/wozos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446038/normal_5f9ffaf8a60b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380882/normal_5f8b62f9e9081.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://uploads.strikinglycdn.com/files/a92ac753-575b-43d0-af71-54ad775034f0/tatiwuxowip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c07ddd3-1086-4faa-9dd7-38399372128a/dokamudiperupurifaju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ceb0f7f-0986-484f-a5a4-e046a8363276/vomulusugufufakajuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccbcee7e-a623-4947-906c-9518a62db871/15883469498.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_off0000d066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD066 4968 bytes
SHA-256: d9af21bfe6fddcd3482db985f13e555c636ff32e5f710770ff7e72f198163e16
font_01_sfnt_off0000e153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE153 10864 bytes
SHA-256: 43f7b55a2177451bf5f9e7d17460303ec2bd18e528f7645eb6b9c2762000d5f2
font_02_sfnt_off0001063b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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