Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c33ae63341ce8b…

MALICIOUS

PDF

76.9 KB Created: 2020-12-15 06:48:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ec18f2ce9902a1d61728806752255c0c SHA-1: 944610d078dfc26eba8d9943a3e4130e085e8373 SHA-256: b7c33ae63341ce8b2e167653415fcd1568c3e75095547cf2c893c8db89288a11
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external links, including one pointing to 'traffnew.ru', suggests a link farm or phishing lure. The document body, though heavily obfuscated, contains strings related to product names and application versions, which are likely used to disguise the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/123?utm_term=goodyear+assurance+tripletred+all-season+225%252F60r17 PDF link annotation
    • https://sanakutubifave.weebly.com/uploads/1/3/4/8/134849958/libowa_zosafafutozija_sunebor.pdfIn PDF document text
    • https://zanasebumafuwaj.weebly.com/uploads/1/3/4/8/134899829/9811080.pdfIn PDF document text
    • https://kirebokiva.weebly.com/uploads/1/3/4/6/134634247/zitepubarexababob.pdfIn PDF document text
    • https://zanubago.weebly.com/uploads/1/3/4/8/134886268/4716292.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/5fc33129affbf90a66f953cc/t/5fc996f02ae1264a038b5600/1607046896900/apple_dual_monitor_wallpaper.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6d054d32fb7060d0dc3b9/t/5fd5f290b1c3f31c7a761be4/1607856786499/burrows_and_badgers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc550135bcb0228a29fc239/t/5fd5f5cbffab5d3c56ef2520/1607857611669/chess_player_lookup_old_format.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f975bf71053ccb109642/t/5fc121aff3de5e49b58cc814/1606492593928/gikuvofif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85153258-edd5-4f0e-883a-d5e16afbad58/biophysics_and_instrumentation_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e3c052f-4d80-49ac-b601-f55ae7b77555/83086697453.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf49c13f75b16643cb4124/1606371780185/walmart_10k_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/528ebd0d-3ddd-45d5-8f3f-be1068e819c2/80065335878.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7b3a943c5ee75bf2de11a/t/5fca672a8583b415842e04a0/1607100202832/dibiletal.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE18 5952 bytes
SHA-256: 1faf09888daf1ab63e0416427cfb66e2e76caed885239ca3e329a40f1c674613
font_01_sfnt_off00010290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10290 10504 bytes
SHA-256: dac9d18f59bdf7768b0b2bf3d4ac91e6f3153601892b7e49f6bf05aa33beb330

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