Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98f7270527073c3…

MALICIOUS

PDF

73.2 KB Created: 2020-11-18 07:08:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f9fe99d2c29f6c6f1a19f1e16060a534 SHA-1: 5344d6c280be7f1848dc327e8e96df896f936899 SHA-256: a98f7270527073c391dc57ac2387d85407dc3b54826e7818d478f7c666b3595d
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=estilo+high+tech PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386349/normal_5f8d514a20646.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493198/normal_5faad6f53495e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409239/normal_5fb477126ae26.pdfIn PDF document text
    • https://fopimakalegej.weebly.com/uploads/1/3/0/7/130738542/wunit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376870/normal_5f998fa2197ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389366/normal_5f96cb7c3de99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389606/normal_5fa7b3fe7e641.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_5fb2d9f9dd68f.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/pomaxa/kitchenaid_cookie_sheets_costco.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/14203214744.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/74457036378.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d55671bf-e2fa-48c7-ba2f-cc2d84589d4c/38406483783.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/caballo_de_troya_8.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/guitar_hero_3_bonus_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/negaxugililuvolekokikoz.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_off0000e551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE551 4712 bytes
SHA-256: b5368e2849f6dd9d5f856fa9a5d9aade760d567396e815f4b5fb7160b5add03e
font_01_sfnt_off0000f563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF563 10076 bytes
SHA-256: faf1c8f1f91572b141a151551f705bb98ac56a98875e9ae7433534c4659f5969

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