Malicious PDF — malware analysis report

Static analysis result for SHA-256 e85e5e3bc8277ad7…

MALICIOUS

PDF

72.6 KB Created: 2020-12-25 07:40:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 9ebdf79c13010762410fd91585f544b4 SHA-1: b6c48ff02b1cb173d0b4d8e2cb4ed3f4732669ef SHA-256: e85e5e3bc8277ad795666167176c2193e3dacb1ed662d679f22db1352e6ad9fc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document employs a social engineering lure, instructing the user to install a browser extension or update to view content, a common tactic for malware delivery. The presence of numerous external links, including one to 'traffnew.ru', suggests it may be part of a link farm or phishing campaign. While no scripts were directly extracted, the PDF structure and heuristic firings indicate malicious intent, likely leading to the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=android+chrome+browser+video+download+embedded PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419433/normal_5fd7f7ff8d2a3.pdfIn PDF document text
    • https://vatalinonabalix.weebly.com/uploads/1/3/4/2/134234662/d2701c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366639/normal_5fd655b70d58b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404296/normal_5fa1229e1a318.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427780/normal_5fdf66c86c48e.pdfIn PDF document text
    • https://disadaniti.weebly.com/uploads/1/3/4/4/134463451/fimizewidonox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456135/normal_5fdd9341acf2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401985/normal_5faab26616d31.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/6ac8fe96-57c4-4924-ac9c-bd858c970374/51221348107.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da5b17fc-a7d2-4778-bc3d-f666e7a60920/vokobijejewin.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18B 5168 bytes
SHA-256: d995fdcc91841fdb2515ffa3232ee13830512fa574f0ec01c6c1f39628a600d1
font_01_sfnt_off0000e2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E5 10632 bytes
SHA-256: 8bee3890d4293a0944aa6ddf0b8ae8e422ca386f18dadc2224ebf197b6acdaa4
font_02_sfnt_off00010715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10715 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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