Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0986dff041c2136…

MALICIOUS

PDF

64.1 KB Created: 2020-12-30 00:55:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a9ad374a59e40a26480c167547b6333c SHA-1: 7a762fccafda015ebd67ff00736ee5a656957baf SHA-256: e0986dff041c2136ed01ae6f97bbcfa1afb0fd3e0a09072486e971932e286f3e
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the presence of numerous external PDF links suggest a phishing or malware distribution campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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/123?utm_term=karyotype+problem+set+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4426830/normal_5fbecf973f0ef.pdfIn PDF document text
    • https://jivenikovo.weebly.com/uploads/1/3/4/3/134308789/liseseja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371004/normal_5fb6d70d342c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464319/normal_5fafeabb38efa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368501/normal_5f93a8ff95c70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366014/normal_5fd64a65557f4.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/jijari/85756982737.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1888afde-effb-4190-9eb4-c5e70a796fd1/jomamuwi.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/75443191301.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/desalination_of_seawater_and_brackish_water.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_off0000c193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC193 5268 bytes
SHA-256: b278d73207fb0755346bec4b6fcca41b8110d12c5cc329483b6d0fdb05bef6c2
font_01_sfnt_off0000d37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37E 9524 bytes
SHA-256: 1a1231e92e8e7d3c459761df1b0c0fff71011dc78c1b8597bdb6dcb6d969d15a

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