Malicious PDF — malware analysis report

Static analysis result for SHA-256 b533f4379bb1ad72…

MALICIOUS

PDF

73.1 KB Created: 2021-03-17 16:15:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 22d8b0def4f34056cc3ee49427bc103c SHA-1: 9a44aacc8cb88ee3088538a6de7fe8b877bab766 SHA-256: b533f4379bb1ad72a90eba2f459920b4d9b971c5773e31c1c758d35c8951eb20
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9996

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://crophysi.ru/strik?utm_term=how+to+transfer+a+call+to+voicemail+on+nec+phone PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384839/normal_6029c86100337.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486363/normal_6049bb65af6ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495855/normal_60373c5b4e491.pdfIn PDF document text
    • https://muxiduxipa.weebly.com/uploads/1/3/5/3/135319221/8861132.pdfIn PDF document text
    • https://zasetumodoroba.weebly.com/uploads/1/3/4/6/134692621/6dd05b3a368c5.pdfIn PDF document text
    • https://pebezudaxefen.weebly.com/uploads/1/3/4/3/134347708/bajefufuduxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383444/normal_602f8b9de0b70.pdfIn PDF document text
    • http://magic-spring.com/hot_springs_prodigy_spa_for_salemq40z.pdfIn PDF document text
    • http://jobauthor.online/mituven951dr.pdfIn PDF document text
    • http://cetop.xyz/106636007269hbc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454043/normal_601518667d0ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479932/normal_6006af4d65200.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468530/normal_6001d3fd2a615.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/sql_formatter_online_tool.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/95579050935.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/timerenonumud.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/shawn_mendes_holding_me_back_song.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/b._ed_online_form_2019_du.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/14341304188.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/72499175593.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/28755667920.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_off0000e051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE051 5368 bytes
SHA-256: 7229c82cd0288cf9e393d21a5274c99c0551e905228f4761d41632c588b1616f
font_01_sfnt_off0000f282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF282 10464 bytes
SHA-256: dc66bf2c513437f9bda728c99b67ba56f3386262a267a3e247159915a5a68645

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