Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37deaeb6a0892a4…

MALICIOUS

PDF

70.5 KB Created: 2020-12-09 11:38:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03c0e937b4d88b20829adc3ac5130bcd SHA-1: 1b69a5de5dc7a980828a120f9e775bbd88b7f260 SHA-256: d37deaeb6a0892a423cd4c863fc7e8a5574fd5e20e3327a01a88c8dd242522ce
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, and is flagged by ClamAV as Pdf.Phishing.Trojan. The embedded links, such as 'https://traffset.ru/aws?utm_term=process+gap+analysis+template+xls', suggest a phishing or malware distribution attempt disguised as a document template. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/aws?utm_term=process+gap+analysis+template+xls
    • https://cdn-cms.f-static.net/uploads/4386834/normal_5f905126bbf9a.pdf
    • https://cdn-cms.f-static.net/uploads/4445338/normal_5fb95b9b0ff5d.pdf
    • https://cdn-cms.f-static.net/uploads/4370777/normal_5f8fb32ce16dd.pdf
    • https://cdn-cms.f-static.net/uploads/4404523/normal_5f991588ea821.pdf
    • https://cdn-cms.f-static.net/uploads/4366381/normal_5f8ea47d34af1.pdf
    • https://cdn-cms.f-static.net/uploads/4408987/normal_5fab57562b01e.pdf
    • https://cdn-cms.f-static.net/uploads/4366009/normal_5f91133360144.pdf
    • https://cdn-cms.f-static.net/uploads/4369160/normal_5f9bffef7678b.pdf
    • https://static.s123-cdn-static.com/uploads/4448980/normal_5fc7c563b183f.pdf
    • https://cdn-cms.f-static.net/uploads/4403429/normal_5fa1c88da5bc4.pdf
    • https://tusidotug.weebly.com/uploads/1/3/4/4/134482214/madapofifimorab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/93bb7013-601a-4b5c-bf59-19d47abe0e84/88961482118.pdf
    • https://uploads.strikinglycdn.com/files/aff6b8bc-751c-4b65-9b90-2eb9e0447c79/duturuluguvapeduz.pdf
    • https://uploads.strikinglycdn.com/files/45f00412-85c0-4030-8c92-2dce032350fe/yamir_and_chelsea_90_day.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_off0000d903.bin
62bf450867576e37f3a01f7b4ab5468fd6f5c6ae77d8490e4b267b957c0ef29d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD903 5424 bytes
font_01_sfnt_off0000eb6e.bin
f3160717dfb752035fb8fa99723e778effc20c209bc40637cfcaae8436fa1c3c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6E 9896 bytes