Malicious PDF — malware analysis report

Static analysis result for SHA-256 31452133dbabcfb1…

MALICIOUS

PDF

67.5 KB Created: 2020-12-11 13:21:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 6df8df61082838f368191c98cdc24509 SHA-1: d5644c8034d803e46b7f28b8c63dd0de27432253 SHA-256: 31452133dbabcfb1fba6ad1852b1de55c4219f62b600101a68fa60a2faf9d50f
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 0.9998

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://traffking.ru/strik?utm_term=america+del+sur PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375076/normal_5fb4a480af622.pdfIn PDF document text
    • https://dusomekekonipa.weebly.com/uploads/1/3/4/5/134580960/vobugujunedidu.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/vukumesoj/liste_des_aliments_riches_en_fibres.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4c46cc89e1c4b8fd75f72/t/5fcc40586f0099009e57061d/1607221336276/kafudefolazokidomabuw.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc51130ea4a794d565ff698/t/5fc681af3c02f22b9dee740f/1606844847751/98022232974.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/75576783715.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/jegelojiwesubadepogepi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe09b79d7936484055a482/1606289850113/voyage_of_the_dawn_treader_book_quiz.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/automation_studio_5._7_gratis_portugues.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/gamosobividuzezagenezom.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe071a173fb5383b68e3a7/1606289181834/tyrones_unblocked_games_qwop.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2b26e405d5340f3353adc/t/5fc728564f9413233b1be00e/1606887513246/gatojorusedaxigojig.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_off0000c9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C5 5072 bytes
SHA-256: f4aa716a9b8d30945d246e69b9e3ae53cf68c05be4872d5deaca4f2dbf420206
font_01_sfnt_off0000daec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEC 11548 bytes
SHA-256: 18815684a2f4a8aa8394bf3b6f965f093dd4e0ef57b5db64d55ba47471c89ae8

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