Malicious PDF — malware analysis report

Static analysis result for SHA-256 643721c0799db845…

MALICIOUS

PDF

67.9 KB Created: 2021-03-25 02:22:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: af4253685cf5f4257b56af26e446d6d3 SHA-1: c590fdeb3fb4a3c57da9a0ffc1d48b4847a0155f SHA-256: 643721c0799db845c7dec442041f18df2688360d79d1697a80e703705d9450a4
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 identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing attempt. The document contains an external URI and an SEO redirector link pointing to 'https://jumiwimov.ru/strik?utm_term=david+c+lay+linear+algebra+3rd+edition+solutions+pdf', which is likely used to deliver a malicious payload or redirect to a phishing site. The presence of embedded URLs and the overall structure suggest an attempt to trick the user into downloading further malicious content.

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://jumiwimov.ru/strik?utm_term=david+c+lay+linear+algebra+3rd+edition+solutions+pdf PDF link annotation
    • http://meetdouche.xyz/11121082245kfh2l.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/aTGFyhg/18613332198.pdfIn PDF document text
    • https://cdn.sqhk.co/butaliwe/if8jeih/sky_sports_on_bt_platform.pdfIn PDF document text
    • http://supfitket.buzz/29119708984eco3g.pdfIn PDF document text
    • https://cdn.sqhk.co/loberutebe/bcWhfhc/providence_telemedicine_washington_state.pdfIn PDF document text
    • https://cdn.sqhk.co/dogojaseziwo/bgj9jam/real_drift_car_racing_3._2_full_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wevavagu/iebYzRu/43881794376.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/xuvamuba/53454548665.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/riwajelopereduwedivud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c164031a-4fd3-47d0-8bea-1010a4aec98c/zeny_cut_50_plasma_cutter_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da8dc3d9-6bd3-48c1-bfd0-8b5c6f5a33a0/56333279925.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22f62ad3-c8fa-4927-bac0-953632510fac/gewefevofipinuwaperi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75781c0c-3fb5-4d65-a4b2-aa9b287340aa/king_of_thorn_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac9a1bf7-94c2-43aa-87ed-597a7c9b9a79/57890551376.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/260ed6a7-103b-4a2c-ac2c-9588b77017f4/flexible_dieting_meal_timing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9411f9ee-5dfb-414d-9747-b54d6bb5ef4f/susupoba.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EB 5788 bytes
SHA-256: ae86c11a9cf7e98f48acd0614f1d49e5becd2d5126c731a2851ba3f316c753a7
font_01_sfnt_off0000dbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC2 11164 bytes
SHA-256: ab9618156a6250cb545dbadcc7b6700320ecb124328d46ab0cc5749528b4b0ed

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