Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb9c44669fba52eb…

MALICIOUS

PDF

71.4 KB Created: 2021-02-03 10:50:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 1d3ac26f1eb36db6e861309fc0ad6868 SHA-1: 3ee9f3e2baa2e1b5ff396d878840db30909adbdd SHA-256: bb9c44669fba52eb587953f0dd6ee3f443f7624fa6de64ec394b14e87a668298
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, indicative of a link farm or phishing attempt, as flagged by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the presence of numerous external URLs suggests the document's primary function is to redirect users to potentially malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/123?utm_term=scp+secret+laboratory+beginners+guide PDF link annotation
    • https://cdn.sqhk.co/xexisini/qAhegd0/unhide_formula_bar_in_excel_shortcut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391013/normal_5fc652be8fb9f.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/beDgePh/best_peace_equalizer_settings_for_gaming.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446762/normal_5ff905fd43132.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407302/normal_5fe5a263a5dd0.pdfIn PDF document text
    • https://cdn.sqhk.co/gibuzini/LjjLWJp/2020_shelby_super_snake_truck_weight.pdfIn PDF document text
    • https://rowopubogapog.weebly.com/uploads/1/3/4/2/134234702/9184c.pdfIn PDF document text
    • https://cdn.sqhk.co/gakilofod/ihaynhb/the_farmhouse_at_veritas_vineyards.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378170/normal_5fce857d37335.pdfIn PDF document text
    • https://cdn.sqhk.co/bexamajuw/ijjahiP/vobukapofop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451374/normal_5fe7067329e21.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/KT64ghP/kartrider_rush_best_kart_upgrade.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/buganabowumujef/free_employment_contracts_template_uk.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_off0000d9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B9 5588 bytes
SHA-256: 0d47c226c2a5f1454cdcb39d3bbb03a7d9db50f9c0b8961f5cc03a6d588496b0
font_01_sfnt_off0000ecc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC5 10576 bytes
SHA-256: 4290ed4330d573b74a5e35e73bd3802887545495bc6a80a8ae03f83376fe5aa3

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