Malicious PDF — malware analysis report

Static analysis result for SHA-256 d48c343276f5fbb2…

MALICIOUS

PDF

73.3 KB Created: 2020-12-25 11:40:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b94274d7d56560219e909831abf0d954 SHA-1: d71e2ef1593f7b76bbb72d73a1d14be5bba420ce SHA-256: d48c343276f5fbb2fbfee5e55bcb0cb2739150493fff93f33d37bbcb6c96e379
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on external services, indicating a link farm or redirection scheme. The heuristic PDF_SEO_LINK_FARM specifically flags this behavior. One of the primary URLs, traffking.ru, is associated with malicious activity. The ML classifier and ClamAV also strongly indicate maliciousness, likely related to phishing or malware delivery.

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=knuckleball+free+kick+fifa+21
    • https://cdn-cms.f-static.net/uploads/4368266/normal_5f8e6cb21c561.pdf
    • https://nibawomufexax.weebly.com/uploads/1/3/4/3/134371272/5087657.pdf
    • https://fanarise.weebly.com/uploads/1/3/4/3/134377412/778096321e6.pdf
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/fumunumivufudizit.pdf
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/7007845.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/efd5262b-175a-4c71-8694-1ff81ed199c4/4354268734.pdf
    • https://uploads.strikinglycdn.com/files/5c829234-86b2-45dc-aeaf-a413a2d5e1e0/62570048395.pdf
    • https://uploads.strikinglycdn.com/files/575ef6da-0270-499e-bac8-f59ca95f96a7/dowomixalatizutas.pdf
    • https://uploads.strikinglycdn.com/files/c49684a4-0c9c-47dd-819e-34d2f1ce867a/kulufamifeminota.pdf
    • https://uploads.strikinglycdn.com/files/fa63433e-89d5-4bef-81c1-525db156f98a/gomukolelabaw.pdf
    • https://uploads.strikinglycdn.com/files/9f3888cc-65bc-438c-8a20-024c37ee8df1/63776152540.pdf
    • https://uploads.strikinglycdn.com/files/b790cd0c-5027-4cb0-a619-a32df7bd41d2/62511140682.pdf
    • https://uploads.strikinglycdn.com/files/7c121e8e-dcbc-464b-acbf-92e26e5c9c24/40391528458.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_off0000e299.bin
da18df50f8ab42eb49d7ecad23d6548198a088719dfd561e48560dad446f33a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE299 5052 bytes
font_01_sfnt_off0000f3e8.bin
c06f440029c1b1120a1b6b61f930bcacc0d60e45802839bd28f895decfd29f9e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E8 10752 bytes