Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8fa42fafb457d8…

MALICIOUS

PDF

72.0 KB Created: 2020-12-25 06:02:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbb74f0a1c127a77d1d0f0995ff962d4 SHA-1: 51332f59c62b8c74ff33de885c734ea9f5ca1c63 SHA-256: cd8fa42fafb457d8be6daad8548b63ec77f60717a52cccaf0587f392f69c707c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffking.ru/strik?utm_term=the+sculptor%2527+s+funeral+quizlet
    • https://static.s123-cdn-static.com/uploads/4373504/normal_5fc48836ac87d.pdf
    • https://cdn.sqhk.co/vipabumumiw/iajbujf/pelumidiwesikogolomixutuz.pdf
    • https://cdn-cms.f-static.net/uploads/4410416/normal_5fabd2e478874.pdf
    • https://static.s123-cdn-static.com/uploads/4444100/normal_5fcdab81709b3.pdf
    • https://jorokepevi.weebly.com/uploads/1/3/4/6/134688072/6191160.pdf
    • https://puzagetidorijes.weebly.com/uploads/1/3/4/4/134495880/xaxivejij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/62d917bc-7518-480e-a861-37dd372a89ac/cannot_open_ulead_photoimpact_10_fre.pdf
    • https://uploads.strikinglycdn.com/files/43805a62-ef55-423d-a1cb-f07b2963f7c3/lajuzubureg.pdf
    • https://uploads.strikinglycdn.com/files/7bfee597-d2d9-4c7a-8a20-120ecb32d3a5/old_age_homes_near_me.pdf
    • https://uploads.strikinglycdn.com/files/ce9ee24b-dddb-429c-967d-ede8c8be3fe3/terobiladubalekokozofek.pdf
    • https://uploads.strikinglycdn.com/files/4bd6070e-7af3-4482-8c22-76b766f040e2/xfinity_dc_channels.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1a1.bin
ed713f1e786c7a24b51370bd15837c30b001badb11a2c98516c1e83d88bd0138
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A1 5144 bytes
font_01_sfnt_off0000e32b.bin
9f37c505e6682b5fba0465363f633e32daf804a2def712323f320d4ff275110a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE32B 10088 bytes
font_02_sfnt_off00010586.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10586 4324 bytes