Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dfc2fd6e3de0e3d…

MALICIOUS

PDF

86.0 KB Created: 2020-12-17 15:45:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 27e764b48930e58c2a5811dde8647abd SHA-1: 1d4a42369a36a07f789ddd6e630e5a23ff7a7199 SHA-256: 2dfc2fd6e3de0e3d8ff6c9048b27972917d7f1e6812897b435983c95ee1e253a
196 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains a heuristic indicating a 'Clipboard command execution lure', suggesting the document instructs the user to copy text to be pasted into a shell. Additionally, an external URI was found, pointing to a URL that appears to be related to Office 365 migration, potentially a lure for credential harvesting or further exploitation. The ML classifier also strongly indicated maliciousness.

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.
  • 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://traffnew.ru/strik?utm_term=office+365+staged+migration+mail+flow PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421767/normal_5fc67e32169c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468530/normal_5fa929973ca13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401732/normal_5faefb17ececc.pdfIn PDF document text
    • https://niforobufuxir.weebly.com/uploads/1/3/4/5/134512868/vugude.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383568/normal_5f9c7c2446ec4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470040/normal_5fd3bd05b471c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458633/normal_5fad6f6c1e66e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0b4e4c89e1c4b8fbd626a/t/5fc2b3af173fb5383bfc0896/1606595504893/female_elf_wizard_dd.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce71dd301bb951f8bebd34/t/5fd0944926d54b3c06d5d277/1607504969469/53358575075.pdfIn PDF document text
    • https://s3.amazonaws.com/juzalizuvar/forget_all_your_yesterdays_line_dance.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/caption_maker_free.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DE 5900 bytes
SHA-256: 284eb3a511509f5589c3d81d9dd71d125e4590d8766edf025f318409df3b2f2e
font_01_sfnt_off000105e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E4 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00010e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E71 11268 bytes
SHA-256: 4eb99158421d14b13edf47f1e061638272cc442d0840a98084bd5d6edf41e62a
font_03_sfnt_off000134f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F1 16344 bytes
SHA-256: 21db139c0406867b12668dd2ff211aba70c09acc61d4b877ca44a4b66ac72427

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