Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace54af858ee0438…

MALICIOUS

PDF

68.7 KB Created: 2021-02-08 19:44:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: eb5bfb493f158ab049a5ce0ea9c2c6bc SHA-1: c802b1ca2486c8d78efd85c58487ca9c260df85f SHA-256: ace54af858ee0438490e509689cb21d98aaa05b952f797166cc2d600e483f1b2
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. It contains numerous external links, with one prominent URL pointing to a suspicious domain. The document body, though heavily obfuscated, appears to be a lure related to a video game walkthrough, suggesting a phishing or SEO spam attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/123?utm_term=borderlands+xbox+360+walkthrough PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4425230/normal_5ff7d4b89a793.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488139/normal_600b1ade3389e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367642/normal_60142b6ab846b.pdfIn PDF document text
    • https://topifovav.weebly.com/uploads/1/3/4/5/134595147/3353569.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/jirebonudur/pugis.pdfIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/mandatory_reporting_laws_in_michigan.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/batman_full_hd_wallpaper_free.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/writing_a_conclusion_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/chronicles_of_narnia_full_movie.pdfIn PDF document text
    • http://mowadavukusut.epizy.com/denurisonobibodewum.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/chemistry_balancing_equations_independent_practice_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/nirewivemapi.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_off0000cebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBE 5960 bytes
SHA-256: 426b5ecf546e099b9da8c0c360c3c2b412f10c830dcb3b7de9b5f33a18c8d0d1
font_01_sfnt_off0000e314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE314 10128 bytes
SHA-256: 3a714d001257e9d4d127b77c76b68e93ef15c94dc34e8aed8749272f74d82c50

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