Malicious PDF — malware analysis report

Static analysis result for SHA-256 a398b07365b6237c…

MALICIOUS

PDF

69.1 KB Created: 2020-12-16 04:04:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d71933bd62916067262024e1688d7b78 SHA-1: 6a08dfc7efc68d80e935f170c84e30c7488fd22f SHA-256: a398b07365b6237c80824af92bdece1b57c456be561179f0acae8d988be3c8f8
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly indicate a malicious intent to lure users to external sites. The ML classifier and ClamAV detection further support its classification as malicious, likely a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/aws?utm_term=daily+schedule+template+printable+free
    • https://cdn-cms.f-static.net/uploads/4373997/normal_5f8da7521a8b0.pdf
    • https://cdn-cms.f-static.net/uploads/4380536/normal_5fd74feb93c32.pdf
    • https://cdn-cms.f-static.net/uploads/4475570/normal_5fab7ae075b77.pdf
    • https://cdn-cms.f-static.net/uploads/4443602/normal_5fbcaaea29f19.pdf
    • https://static.s123-cdn-static.com/uploads/4406213/normal_5fca941368dfc.pdf
    • https://cdn-cms.f-static.net/uploads/4450048/normal_5fa3410b7b612.pdf
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/niwawutonudoninew.pdf
    • https://cdn-cms.f-static.net/uploads/4476582/normal_5fb7d608182d7.pdf
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5fd7edc9852cc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/felasorarabipis/rolugovobafubema.pdf
    • https://s3.amazonaws.com/fowonaxul/gibuwazupalevaputeri.pdf
    • https://s3.amazonaws.com/midaguvimabof/carbon_fiber_sheets_for_cars.pdf
    • https://s3.amazonaws.com/tabagelufazafew/35769220989.pdf
    • https://s3.amazonaws.com/sisaxu/18240944097.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_off0000d1ca.bin
9f3aeffe52c352e8bb8b436bbfff227c3740f873649ae92f6cbc8cf6cb6b08c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CA 5636 bytes
font_01_sfnt_off0000e4cc.bin
e756e71fb695044bb9d3eb7964bc62f38e4d044c03ede8b8808fc42610aa06fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CC 10176 bytes