Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ef4b3046773253…

MALICIOUS

PDF

77.7 KB Created: 2020-11-20 21:12:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 252f69fdd335ac287b1a0bdb6958662a SHA-1: 7b4d2f5a0e2ff2fb6c0095b05be62f816a2acd7d SHA-256: e8ef4b3046773253da06047dfa85a26dcabeae162a80ac6601826f4eb19b84ba
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-severity 'PDF_SEO_UTM_REDIRECTOR_LINK' rule, indicating a phishing lure for free downloads. The embedded URL 'https://trafftec.ru/123?utm_term=mac+os+high+sierra+user+guide+pdf' is the primary indicator of this malicious redirection. The ML classifier and ClamAV detection further confirm its malicious nature, suggesting it's a phishing trojan.

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
  • 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://trafftec.ru/123?utm_term=mac+os+high+sierra+user+guide+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379732/normal_5fab2868e6f3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449965/normal_5fa902090e418.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412394/normal_5f9a22c56ce98.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/f87332d4-f405-4bb2-a74f-fcc22d3cf1d9/scp-_999-_j.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88a5d748-d2e4-4cc8-9591-0c778da818fe/menuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eff1a3f-7eb3-40d4-b3df-3a8f8cd698e0/gta_5_manual_transmission_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/general_ledger_interview_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e8de9f4-6ae5-4dea-9802-75d16a19dfae/leadership_theory_and_practice_northouse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0bd6ab5-eb75-4003-9ebd-9b8393ecef1d/gadegirevavebu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/186cc275-33f7-4a8c-9dc2-a3cfbb1ecce4/hotels_near_san_carlos_beach_monterey_ca.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/89723650397.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c269a5a-2b4e-4f96-8601-151e549cadc5/gopawalinutivini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ccc3563-c473-4fd5-b1d2-18442d95e31f/sofusijikuruzid.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE537 3680 bytes
SHA-256: bca829b600b331d66ed560b4d6f7fe0bea1b896300cd09f966e20ef66f984451
font_01_sfnt_off0000f252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF252 5388 bytes
SHA-256: cacf8406129c36f8c73658e50a74cc0bdf0dadf0422d079710d3e24349594a5a
font_02_sfnt_off000104a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A9 10896 bytes
SHA-256: 28aaffe66e9d6d52e3f58ff5cf9466536d808dc3828bf69c3be161772b75c7f4

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