Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8519e83489a979…

MALICIOUS

PDF

70.4 KB Created: 2021-01-01 09:40:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f85fb01401c39a0b8e1e477fb971dad SHA-1: 7c2a75ec94056cc78bd0b00ba6549ef34fc39032 SHA-256: dc8519e83489a979ca74f67317cdb506ecacfa4d70343169a147c4d9a1564646
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The primary URL points to a lure for downloading 'Call of Duty Mobile', indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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.
  • 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://trafffi.ru/strik?utm_term=call+of+duty+mobile+download+play+store+link
    • https://gubaxefu.weebly.com/uploads/1/3/4/5/134592394/sumaruf.pdf
    • https://zodebosamu.weebly.com/uploads/1/3/4/4/134444592/dd0bdcad63de.pdf
    • https://cdn.sqhk.co/susiwozobo/jfkggCy/dijixinasadetuduzolufe.pdf
    • https://wizakamulo.weebly.com/uploads/1/3/4/0/134017688/8048428.pdf
    • https://vuxarujetununo.weebly.com/uploads/1/3/4/4/134437765/vanuvolilikafi.pdf
    • https://cdn-cms.f-static.net/uploads/4380219/normal_5fa60eef8e905.pdf
    • https://napokepuwaju.weebly.com/uploads/1/3/1/1/131164128/rorekifusilojaxapolu.pdf
    • https://telanadiv.weebly.com/uploads/1/3/4/4/134495792/3693884.pdf
    • https://cdn-cms.f-static.net/uploads/4368951/normal_5f90e1cea3fbc.pdf
    • https://static.s123-cdn-static.com/uploads/4413228/normal_5fc7114bd4fd7.pdf
    • https://cdn-cms.f-static.net/uploads/4374188/normal_5f94d5fad845f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000d289.bin
6adcba772c387f0727f554a924d3338a4cb5c0c159f0dc7594160850fc2a5f0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD289 5488 bytes
font_01_sfnt_off0000e532.bin
6ffff8dc1c43e2f50a949a27be46d9de59ac50e67ebda6a8d43a9044b05cfbf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE532 11564 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.