Malicious PDF — malware analysis report

Static analysis result for SHA-256 825f8a703bf9c811…

MALICIOUS

PDF

85.2 KB Created: 2020-11-26 07:48:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: c0df5089e7d85e4d46ce93a7afa57018 SHA-1: 9ba7ef145402395e357d30de962b3759366de20b SHA-256: 825f8a703bf9c811d40f38c46c2d21676f93f3a2a8e0e172dc46540ec5cb9fa0
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The primary URL, https://traffnew.ru/strik?utm_term=wcw+war+games+1991, likely serves as a redirector to malicious content. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://traffnew.ru/strik?utm_term=wcw+war+games+1991 PDF link annotation
    • https://mavezuwunokil.weebly.com/uploads/1/3/4/6/134627141/pijuvetuvimader.pdfIn PDF document text
    • https://wipomozexabezi.weebly.com/uploads/1/3/0/7/130776841/de461ec89e.pdfIn PDF document text
    • https://pawomasa.weebly.com/uploads/1/3/4/7/134737305/rezog_rogamafirumip_busulurasu.pdfIn PDF document text
    • https://mefevujeloz.weebly.com/uploads/1/3/4/3/134317202/3556922.pdfIn PDF document text
    • https://suxobotomifupol.weebly.com/uploads/1/3/4/4/134445318/5803025.pdfIn PDF document text
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/kutimamovux_defusafun.pdfIn PDF document text
    • https://linezeludamaxen.weebly.com/uploads/1/3/4/3/134340908/7604019.pdfIn PDF document text
    • https://bujapuvewujik.weebly.com/uploads/1/3/4/7/134702992/wusezuzamuki.pdfIn PDF document text
    • https://mojipofewer.weebly.com/uploads/1/3/4/4/134497536/3106910.pdfIn PDF document text
    • https://duvonejubuzal.weebly.com/uploads/1/3/4/3/134321315/933a0e9ba.pdfIn PDF document text
    • https://tipowunukal.weebly.com/uploads/1/3/4/3/134355136/4be2faed36.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sabegokek/17541035061.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/43833822511.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E9 5400 bytes
SHA-256: 9958d21cf4696facfb76f51fff5fede9066fefc6cf0b5719e39bb2ef39a31962
font_01_sfnt_off00012352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12352 10924 bytes
SHA-256: b0150d314c2ae57c23e3e9c55a797e0d01828b6f5ace9f29f6c172373ad74458

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