Malicious PDF — malware analysis report

Static analysis result for SHA-256 571dfae0d1e10a06…

MALICIOUS

PDF

68.2 KB Created: 2021-01-17 05:43:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 388e32455f7354a7aa985b4a70ce4975 SHA-1: 255702e2e39728db0fc25fbf917e8cc32ea93490 SHA-256: 571dfae0d1e10a06e4cd21a8f24c88118f4c09991ca34c6c3c83b711c75db45d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous embedded links to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, indicates it is masquerading as a "Theoretical yield worksheet" to entice clicks.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=theoretical+yield+worksheet PDF link annotation
    • https://site-1172793.mozfiles.com/files/1172793/dogawimoxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365656/normal_5fa3ef3950eae.pdfIn PDF document text
    • https://site-1172205.mozfiles.com/files/1172205/cute_funny_gif_download.pdfIn PDF document text
    • https://site-1173589.mozfiles.com/files/1173589/zupogoranizomagafisimag.pdfIn PDF document text
    • https://site-1176165.mozfiles.com/files/1176165/ceramic_tabletop_christmas_tree_with_lights.pdfIn PDF document text
    • https://site-1210512.mozfiles.com/files/1210512/fishing_game_report_in_new_orleans__com.pdfIn PDF document text
    • https://site-1177968.mozfiles.com/files/1177968/idle_tuber_empire_apk_day.pdfIn PDF document text
    • https://site-1172046.mozfiles.com/files/1172046/30034750205.pdfIn PDF document text
    • https://cdn.sqhk.co/tinipuded/O6NPFhb/tower_defense_kingdom.pdfIn PDF document text
    • https://site-1172079.mozfiles.com/files/1172079/22158273452.pdfIn PDF document text
    • https://site-1172683.mozfiles.com/files/1172683/12991779851.pdfIn PDF document text
    • https://site-1177159.mozfiles.com/files/1177159/80390095986.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/pisedij/39067268807.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_off0000cdd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD6 5236 bytes
SHA-256: d937120f3c2823b2b530d046f9e873987ee6daf12a4d3ed9e7085946174001d3
font_01_sfnt_off0000dfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB2 10136 bytes
SHA-256: 1e9e5d466191ce10accc9b448ed0774bfd5f456a5ef237b6b3e8cc3bf6c7e683

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