Malicious PDF — malware analysis report

Static analysis result for SHA-256 407888bda9d09f7b…

MALICIOUS

PDF

74.2 KB Created: 2020-11-09 22:36:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 658479db2d8e81efb7b00d70110ba445 SHA-1: 977fd832f2b1f928ee65350498e72d0fe940d9ee SHA-256: 407888bda9d09f7b392e274b2f355e3bea06577d9457c221de4cf72c7e7e48f7
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a clipboard-command (paste-and-run) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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
  • 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://traffine.ru/aws?keyword=minecraft+building+mods+1122 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457573/normal_5fa1e46f5cb4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403824/normal_5fa2e31dce9f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381730/normal_5f964eb563f09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379487/normal_5fa988539f5c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366366/normal_5f88c8ff19d43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408187/normal_5fa0d6eb26373.pdfIn PDF document text
    • https://tusidotug.weebly.com/uploads/1/3/4/4/134482214/mifajusiramin.pdfIn PDF document text
    • http://www.opentle.orgIn 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/95acc60c-b23f-4e59-8b10-1bb99539964b/57455072897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/974a5235-f33f-4d5e-854c-59c4d40a1bae/factotum_dnd_3.5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7667958-e7e1-4dfd-8851-d0c7fd3b8b5c/sazawoxa.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000cddb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCDDB 15880 bytes
SHA-256: 8af78541871b024169b09c6ccf4bee9aaa2dbfc8b782dbe6d8cd8733cefa0dce
font_00_sfnt_off0000baa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA1 5672 bytes
SHA-256: c313277359a83d8827d5e53f04cbb2654abd04cebcee9715aa3f4a12c2f411fd
font_02_sfnt_off0000f943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF943 10136 bytes
SHA-256: 42882e0eeb60737383ed5450d80e4035f3e01f3f66764038524aff1f27dd9535

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