Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a52b610bf0bae77…

MALICIOUS

PDF

70.1 KB Created: 2021-02-23 08:39:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c31ddc033c7adfef09860fe3e500ec15 SHA-1: d59b1bb94678a53613ab54c777f18a8e201cf386 SHA-256: 3a52b610bf0bae77227cb9ca55d1e4de3999cc97161df36deba2a4fef1a8d586
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a phishing lure, using a deceptive title to trick users into downloading it. The embedded URL points to a redirector, likely leading to further malicious content or a phishing page.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://bologen.ru/wix?keyword=surgical+technologist+certifying+exam+study+guide+3rd+ed PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374021/normal_5fe14ec2e30c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413111/normal_5ffb28c88f1b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407301/normal_602d96b1eef9b.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/jjg1EJ5/nba_g_league_ignite_roster_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457302/normal_601f0cf289541.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412379/normal_602f00f348e33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381531/normal_5ff8a72d2cc63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446152/normal_6029b014f1b83.pdfIn PDF document text
    • https://cdn.sqhk.co/posebozej/nBDibgi/sdgr_stock_price_target.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406168/normal_6006d9e0a1b41.pdfIn PDF document text
    • https://cdn.sqhk.co/budafitanu/eSXIjht/time_flow_game.pdfIn PDF document text
    • https://dosupara.weebly.com/uploads/1/3/1/3/131380612/2f1793653f98e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374362/normal_60223cf0ac7ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449177/normal_6025776562c44.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459034/normal_5fdfdf0c09ed7.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/xakapudakadu/zukaxeza.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_off0000d314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD314 5872 bytes
SHA-256: ec76265caaf84149256b79003f9e24fdb4c5e01a7d283c269b68e428fddbb9a4
font_01_sfnt_off0000e6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FB 10548 bytes
SHA-256: 1985134447ad435905769845325ba20713eb3f71c304dc7e04e1680ec1e70c7c

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