Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c5eb5e7b9bd14c…

MALICIOUS

PDF

69.6 KB Created: 2020-12-27 05:23:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: deb12407d3054677eb2d2794aa43d996 SHA-1: b3bbfd38d633bc8082c64d2081af20f67a052761 SHA-256: a0c5eb5e7b9bd14c5843fc161e91c62684c68a8551056555cbc24d423fe6352f
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 are hosted on dynamic DNS services and appear to be part of a link farm. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a malicious intent to redirect users to potentially harmful sites. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware distribution.

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=kill+the+plumber+2+game
    • https://cdn.sqhk.co/dabeluza/O6ig1ge/aafes_promo_code_september_2020.pdf
    • https://cdn-cms.f-static.net/uploads/4415740/normal_5fdb79c242cfd.pdf
    • https://wipugetawunuw.weebly.com/uploads/1/3/5/3/135302850/6e98de6c52.pdf
    • https://cdn.sqhk.co/juxerawabuf/7mhhieN/fogewilobazizivanelivezag.pdf
    • https://kefobisow.weebly.com/uploads/1/3/4/7/134733217/xaxedewevanosig.pdf
    • https://jewelilug.weebly.com/uploads/1/3/4/3/134331877/85f4c04.pdf
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/e5bcd2697.pdf
    • https://cdn.sqhk.co/zupuguvawaj/TOOrCZ2/who_else_died_in_it_chapter_2.pdf
    • https://jomigotub.weebly.com/uploads/1/3/4/7/134748998/ca044.pdf
    • https://cdn.sqhk.co/zenetofuma/gfHLXja/zaduzinuvix.pdf
    • https://cdn-cms.f-static.net/uploads/4403805/normal_5fbc14132dd3c.pdf
    • https://cdn-cms.f-static.net/uploads/4417531/normal_5f961070ebfff.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/63a8dfc0-3b8f-4b71-a86e-8eef411a5bfa/rafowevixasafinidilatol.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_off0000d3cf.bin
99474f0ee1c82e469077807548b3ba9ec81e8f408415d35b04ee40ae2cea0c98
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CF 5296 bytes
font_01_sfnt_off0000e5ac.bin
475b5218a30c4c5c0767ff09dd09dd4aa3f78b1e31b538d9e986765deca1335f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AC 10588 bytes