Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da973ba5ca8a67c…

MALICIOUS

PDF

76.9 KB Created: 2021-05-20 06:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32cf6d1aec771061639b3340a2e5a112 SHA-1: c09e869d9e24397fb821489a8e729fd278caced9 SHA-256: 8da973ba5ca8a67c6551f2f1cd01a952afd5ab827c844f9cbe91774da3da4247
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 pointing to Weebly-hosted PDF files, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially malicious content, possibly for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=how+to+take+apart+a+magic+chef+ice+maker
    • https://nigiseza.weebly.com/uploads/1/3/4/4/134462574/zufidivoxapane.pdf
    • https://divuvefa.weebly.com/uploads/1/3/4/7/134759037/3e47c90e8dcd8c.pdf
    • https://fujazilumekopel.weebly.com/uploads/1/3/2/6/132681311/fbf046048f2efa3.pdf
    • https://cdn-cms.f-static.net/uploads/4373520/normal_6016e6bc5e3bd.pdf
    • https://nezasitize.weebly.com/uploads/1/3/5/3/135303973/zegum.pdf
    • https://static.s123-cdn-static.com/uploads/4371786/normal_5ff917846829a.pdf
    • https://goxejebifebiv.weebly.com/uploads/1/3/2/6/132682819/literoko.pdf
    • https://robugagemo.weebly.com/uploads/1/3/5/3/135304688/sapura_xasozif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7a4c7c04-4cab-4e0d-a69d-ff08559fd15e/degarmos_materials_and_processes_in_manufacturing_12th_edition_download.pdf
    • https://uploads.strikinglycdn.com/files/8155d23c-6dc7-480f-95d6-c107ce6ef07f/zupeli.pdf
    • https://uploads.strikinglycdn.com/files/54e73707-b19d-4c9d-b48c-5cf8f8cb96f9/14356782290.pdf
    • https://uploads.strikinglycdn.com/files/0b40d8b9-cd3e-4a59-b3ba-9e00c475ad5e/wuboviva.pdf
    • https://uploads.strikinglycdn.com/files/798ff0a5-4934-4354-9104-2d467b6d823f/10648233776.pdf
    • https://uploads.strikinglycdn.com/files/68d02fd4-7df6-4b0d-b58b-0be2af3e335f/miwelas.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_off0000eeab.bin
f89a1c46fd05c46e3b2fa4c26eca7394cc68ff2c6c59b70c7e50987e6a0feccd
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAB 5336 bytes
font_01_sfnt_off000100c4.bin
30c87560bcb970a87e0d1dc40ea188af8d219c7c0f99f8330eb025044ba60dd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x100C4 11072 bytes