Malicious PDF — malware analysis report

Static analysis result for SHA-256 675ccc4fb2720db4…

MALICIOUS

PDF

70.4 KB Created: 2021-01-09 00:28:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 95724d3611f6a6cae9d5d2b1a8e2c9f4 SHA-1: 751bdfde4f4cec1de8af62c937fd180871c49e1e SHA-256: 675ccc4fb2720db4b3fb5f5bae52bee7124afa9a849523d95bfd6780b839742f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which are to unknown or potentially malicious domains, suggesting a link farm or phishing attempt. The document body is heavily obfuscated, but the presence of external URIs and the overall structure strongly indicate a malicious intent to redirect users to harmful content.

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://trafffe.ru/123?utm_term=kohler+sv600s+parts+manual PDF link annotation
    • https://gexeperi.weebly.com/uploads/1/3/4/3/134348656/ximijanenu.pdfIn PDF document text
    • https://cdn.sqhk.co/potasuregoz/BoILieL/rasiwitabaga.pdfIn PDF document text
    • https://xanugobolenaz.weebly.com/uploads/1/3/4/3/134371028/9602690.pdfIn PDF document text
    • https://wijodemarivupi.weebly.com/uploads/1/3/4/8/134861972/sodubusi_tabenu_dikonal_divasetazop.pdfIn PDF document text
    • https://kujugozu.weebly.com/uploads/1/3/4/6/134660126/mejoso.pdfIn PDF document text
    • https://denasigetul.weebly.com/uploads/1/3/4/3/134332190/bawoletibutan-bigedotusapig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc8f8f80-15b9-4725-a001-2665ae89b41a/pidulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0948942-a0cd-4d14-a09b-28fa5e0b055f/spider-_man_bullet_bike_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58a6071e-4589-4be7-bfb3-d75fa8f6599b/epson_sx420w_driver_windows_7_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66df6dab-c83b-4af7-acdb-8835e179a861/christian_service_charities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b955187c-4892-407a-b0df-da8b869e7acb/mods_for_survivalcraft.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f271d335-be94-4795-9fed-8c909ee1e755/gebomijuwolevesugedixaxaw.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_off0000d4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A6 5384 bytes
SHA-256: 3bb835830dc293578064575988a37ed35e1d8b9cdfeffd0f03b8c82397484158
font_01_sfnt_off0000e6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D6 11204 bytes
SHA-256: b4ff322383a5e798d96fc89ecfbcd4d745f6a90b176598e5f224e5e7eb2a5ba9

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