Malicious PDF — malware analysis report

Static analysis result for SHA-256 3275db6e7715d086…

MALICIOUS

PDF

76.3 KB Created: 2021-03-24 18:58:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1e6550fd69f03ef46874999064def397 SHA-1: 23333f1d5830829430c23a905b1d2ecd95277b20 SHA-256: 3275db6e7715d0869402edcb88b4d2f2186dcf40e337b74c2606164f430db79b
136 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a phishing lure, specifically using an image to redirect users to an SEO redirector. The primary malicious URL identified is mezovuduw.ru. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mezovuduw.ru/strik?utm_term=baby+bullet+replacement+parts PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4453563/normal_5fc6b19f193e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495999/normal_5fe55dede57a2.pdfIn PDF document text
    • https://pujelewi.weebly.com/uploads/1/3/4/0/134017294/daruwofep-kibunu-sopemadu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383470/normal_6026512a4292f.pdfIn PDF document text
    • https://pejejuwefosewa.weebly.com/uploads/1/3/4/0/134040570/6623039.pdfIn PDF document text
    • https://cdn.sqhk.co/zezoxomop/KhbjcOa/zejurivebebufasavopovo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421040/normal_6001bfc0cf81f.pdfIn PDF document text
    • https://cdn.sqhk.co/golemejexeno/pJi5lhi/best_music_player_for_windows_10_and_android.pdfIn PDF document text
    • https://sejomuxajifaged.weebly.com/uploads/1/3/1/4/131437693/xelexevub_fasitu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469836/normal_60483843837fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367674/normal_5feb5ec644441.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465402/normal_603d472a59e85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372384/normal_5fdf8ced0c440.pdfIn PDF document text
    • https://nolulanulupu.weebly.com/uploads/1/3/1/3/131379612/libadekofaju-zotiwuwas.pdfIn PDF document text
    • https://cdn.sqhk.co/zijopenuxafi/h9giAhe/batman_the_enemy_within_review_ign.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448330/normal_600a518929fe7.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/fojaxexino/74949733385.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50733f20-a196-486d-91cf-0c7d8012b937/how_much_is_a_case_of_premier_protein_at_costco.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ead35625-d288-4f88-87ae-c80969eea90e/harry_potter_6th_year.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d694c4d6-09ee-45fa-8570-fe212a7aa92e/wazanu.pdfIn PDF document text
    • https://s3.amazonaws.com/subopukomanaw/18841724878.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/769a7dc1-e2d0-4a4c-8b68-3a51970e6564/entalpia_de_combustion_del_octano.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/gepifopememivewuferu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/979a973a-bfcd-442a-bb4c-172405558ebc/51584943104.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_off0000ec87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC87 5368 bytes
SHA-256: 9f770d4b8d40910c9746e89de2bab6437253f7d003c6aefdc6430bb7c7dfa1cb
font_01_sfnt_off0000feb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB5 10752 bytes
SHA-256: 175ba127f15c606671ab4342e19a397d3db62b2e5ef0dfc97120ef8a6a0ed8db