Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39d653f2f0491f3…

MALICIOUS

PDF

69.0 KB Created: 2020-11-14 07:11:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1697b28ecfd2278cdca9f0eb49a5db4d SHA-1: de0cb3dc29b1bf9a823885694838201dc453edf8 SHA-256: b39d653f2f0491f3b7735978a168946641bebadbdb3ab9e7e154c71d59aae1b0
260 Risk Score

Malware Insights

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

The sample was flagged by multiple critical heuristics indicating malicious redirector links and a link farm structure. The ML classifier also strongly indicated maliciousness. The PDF contains numerous embedded URLs pointing to various hosting services, including Weebly, suggesting a broad distribution effort. The presence of a 'Google chrome beta app' lure in the document body, combined with the link farm, points towards a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=google+chrome+beta+app
    • https://sakukavazu.weebly.com/uploads/1/3/1/3/131379729/684651e15.pdf
    • https://mokitigek.weebly.com/uploads/1/3/1/6/131606839/bibawi-koxesu-xasoluv-wifoditonapa.pdf
    • https://remezimivof.weebly.com/uploads/1/3/4/5/134582621/pefisabidiwi.pdf
    • https://kugugurufive.weebly.com/uploads/1/3/4/1/134108893/4bec5902d9d1831.pdf
    • https://wabebapag.weebly.com/uploads/1/3/4/3/134335427/bolinukekuvokug_nigeresarowunuz.pdf
    • https://gepagalegizexu.weebly.com/uploads/1/3/4/4/134478943/18bc1a62951172.pdf
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/kijobe-lokib-setumepux.pdf
    • https://cdn-cms.f-static.net/uploads/4389353/normal_5f9d1d305f75e.pdf
    • https://cdn-cms.f-static.net/uploads/4372735/normal_5f8d0b1b13370.pdf
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/21fbe111f5c4ae.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/liguwubore/sowupedofukuladumukiboxu.pdf
    • https://s3.amazonaws.com/waxapoz/simple_dog_house_plans.pdf
    • https://uploads.strikinglycdn.com/files/4d993a96-ce7e-4426-a3b1-3f7b00b887c2/ravolabavobanuno.pdf
    • https://uploads.strikinglycdn.com/files/b16d41ef-79c6-4271-a97f-420aa21bf3bf/nojopinase.pdf
    • https://s3.amazonaws.com/baposivarabuj/driver_asus_x453m_win7.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_off0000d080.bin
c9175a8cc9eaf5894cf695c86f7db016787e8241a81a8875b149a5b27f6a4e66
pdf-font-stream PDF embedded font (sfnt) at offset 0xD080 5340 bytes
font_01_sfnt_off0000e285.bin
3f2201eb412340371b8ec9efe6ea13e749ed7dc99975912915c11d21ca02ac31
pdf-font-stream PDF embedded font (sfnt) at offset 0xE285 10856 bytes