Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed0361a18fc269a3…

MALICIOUS

PDF

69.4 KB Created: 2021-02-18 10:52:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 848deb5943ec4fadeec44e53cab06a82 SHA-1: 455c8a8b887201cadff6a96302f1901f7020e06d SHA-256: ed0361a18fc269a3a5af52a5218e0927b40755ce4f40ec7b63c92e79e7088c91
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' containing 28 links. The document body, though heavily obfuscated, suggests a lure related to a summary. ClamAV and ML classifiers also flagged this file as malicious, indicating a phishing or malicious content distribution attempt. No scripts were extracted, but the presence of many external links points towards a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=the+man+of+the+crowd+summary PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4502493/normal_5ff138fd1c8fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417119/normal_5fc89366d792b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452621/normal_5ff2c46eb064e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380858/normal_5fedd316748e6.pdfIn PDF document text
    • https://terusabul.weebly.com/uploads/1/3/4/7/134702655/wabobofomapotas-dosoxafezasej-nilitifug.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/kelageketisefuv/av_malformation_brain_radiopaedia.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/35657027827.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/displacement_velocity_and_acceleration_worksheet_answers_key.pdfIn PDF document text
    • http://bapexuzajo.epizy.com/193059143.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/zuxunakufasokodebi.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/wiwevaresuvo.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/english_grammar_lessons_advanced.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/game_brother_in_arms_apk_obb.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/tabenulatutuwebewilul.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_off0000d400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD400 5372 bytes
SHA-256: 751623200a9bad7c14ac8d80db5ba89ee64729ee8572a917d2b4d18e241f0144
font_01_sfnt_off0000e631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE631 10112 bytes
SHA-256: 8e9044d8b67194540cfc403e35653687ea65e2d449b1365b81bbb6d82355b328

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