Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d1c43ffce8bb31…

MALICIOUS

PDF

69.8 KB Created: 2020-12-30 10:53:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 26d12ee77f690608121cc878cb49709c SHA-1: 607eb4565ee601b9d6638ff7a68fa6b76ca369df SHA-256: b1d1c43ffce8bb31642e9bea347ca26131c28a522b8eeaabd9e786223581ca59
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF documents, suggesting a link farm or SEO poisoning attempt. The primary URL, 'https://trafffe.ru/wb?keyword=goosebumps%20night%20of%20scares%20chapter%203', indicates a lure to a malicious website disguised as a search result. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

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://trafffe.ru/wb?keyword=goosebumps%20night%20of%20scares%20chapter%203 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420448/normal_5f9c09c0344da.pdfIn PDF document text
    • https://mipolapepel.weebly.com/uploads/1/3/4/3/134395859/tuxofitiwetuzexuraka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371240/normal_5fd893f528763.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456998/normal_5fcafd3741ffc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373749/normal_5fbb6a26d889d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383800/normal_5fc6db81e34e5.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/xozeb/balev.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/10_class_science_solution.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/water_soluble_vitamins_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/hemoglobin_dissociation_curve.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/radium_girls_monologue.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/cdc_guidelines_for_intravascular_catheter-_related_infections.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/607_area_code_location_lowes.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_off0000d147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD147 5732 bytes
SHA-256: bbe52306d83813bb92abe33ea53788a3e6f98b7fb6864481bac52ff325b540d5
font_01_sfnt_off0000e4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A9 10888 bytes
SHA-256: 7d7e2ea3a30d6ed45ed1b091880c8032f8e2c12c8c3685f36ad2cabde1771296

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