Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a9e35814cc5161…

MALICIOUS

PDF

71.1 KB Created: 2020-11-19 08:12:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 0751347be44cf3e39c9a841b01c8de47 SHA-1: 3379fcc84800ee02d560eed9ff94107e25c9b2d2 SHA-256: b2a9e35814cc51616debc24843fbfdd3f0feb13cadff31c4f815cd9fc60ccbc3
294 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File Execution: User Execution T1059.001 Command and Scripting Interpreter: PowerShell

This PDF file exhibits multiple critical heuristic firings, including a malicious redirector link and a general ML classification of maliciousness. The document body, though heavily obfuscated, combined with the 'SE_CLIPBOARD_COMMAND_LURE' and 'SE_CLICKFIX' heuristics, indicates a social engineering attack. The user is likely instructed to copy and paste a command into a terminal, which would then download and execute a secondary payload from the identified malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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/strik?utm_term=symantec+endpoint+protection+removal+tool+windows+10 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366628/normal_5f9da2693b3b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393208/normal_5f9e33f013a3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366639/normal_5f8941417d12d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417995/normal_5fa8ed3e6bab7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368235/normal_5fa18004920e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475854/normal_5fa78c5ce71a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495551/normal_5faab2cc92624.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391302/normal_5f8f2f0552a2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386593/normal_5fa0262eb4198.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374013/normal_5f8b82b4c89c7.pdfIn PDF document text
    • https://pefojefevofat.weebly.com/uploads/1/3/4/6/134659321/54619a.pdfIn PDF document text
    • https://setisobizosepi.weebly.com/uploads/1/3/4/6/134670504/posovovibetuzu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c597bd73-57a8-49a8-9e14-1a93f597eda0/lopesubod.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_off0000c759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC759 5768 bytes
SHA-256: d6efdb79d8d1165918043cde76f8cbf119c0f00527f98556f0fbd489bb40069c
font_01_sfnt_off0000dafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFB 4616 bytes
SHA-256: 37a9474dd98440e6dc0920dfdf556a8f896a10a308e718694c28a6832a682755
font_02_sfnt_off0000e966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE966 10864 bytes
SHA-256: 018bb4e3245f016af67aaec88574cf6287079edc47bc5513c5366b8462619345

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