Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b96b5f6f682b473…

MALICIOUS

PDF

68.6 KB Created: 2020-11-18 22:42:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3861e8bd01d67173518e66fb38aaf18 SHA-1: ec57f814b92d7cb2185ae371b54a0c4a84de3977 SHA-256: 9b96b5f6f682b473a85de2b83a6b53675d9ba536b07cbcfdf08290dbd50af655
244 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm, with several pointing to known malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=game+dev+tycoon+guide+mmo
    • https://pepadamive.weebly.com/uploads/1/3/4/4/134468065/1507907.pdf
    • https://wabebapag.weebly.com/uploads/1/3/4/3/134335427/2e2cfcf4.pdf
    • https://vijejomikozo.weebly.com/uploads/1/3/4/6/134668467/votubabakovi_wizaxeb_gatakut_kapusa.pdf
    • https://jajewivazag.weebly.com/uploads/1/3/4/4/134491582/wazobalog_baxekas_sowok_makonikevas.pdf
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/f5d445.pdf
    • https://guferewefozitak.weebly.com/uploads/1/3/4/3/134393558/9687682.pdf
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/movav.pdf
    • https://mokoluwi.weebly.com/uploads/1/3/4/5/134595511/4160f.pdf
    • https://nogomikosisodop.weebly.com/uploads/1/3/2/6/132681488/73bfbf9abc8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c4b6d50b-8561-4d9f-a9bf-af501f4bc161/38554193497.pdf
    • https://uploads.strikinglycdn.com/files/8f419b85-0a7f-4760-9b32-228ec83eccc3/cen_tech_multimeter_continuity.pdf
    • https://s3.amazonaws.com/zikeko/camera_360_lite_2019.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfb3.bin
bb9c6a44b65535f32cbf3a99a63b2b161b78d0789db4f4fd95749bd072cfe036
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB3 5144 bytes
font_01_sfnt_off0000e13c.bin
8c4c288fc3c270d8a1dd49517a18f75d72de106e0914ec098567519e4292c260
pdf-font-stream PDF embedded font (sfnt) at offset 0xE13C 10744 bytes