Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfbde9b82467da3e…

MALICIOUS

PDF

77.0 KB Created: 2021-03-15 16:15:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10be057b1a7bdadb762e5bc2d6e1a87f SHA-1: 764a983ee83633a6c1e6b53bdf60ee137b00b859 SHA-256: bfbde9b82467da3e7538d61ebcca22448064b5514824afd77144fc27298c26c3
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier. It contains a large number of external links, with the primary one being to 'dafemum.ru', suggesting a phishing or SEO spam campaign. The PDF_SEO_LINK_FARM heuristic indicates a mass of external PDF links, likely intended to manipulate search engine rankings or distribute further malicious content. No scripts were extracted, but the presence of numerous external links points towards a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/wix?keyword=play+backyard+baseball+2001
    • https://cdn.sqhk.co/levowexesu/3Iijdxc/quiz_twd_9_temporada_assistir.pdf
    • https://zokesafan.weebly.com/uploads/1/3/0/7/130775675/gujosituzewokeribur.pdf
    • https://naxofezuwu.weebly.com/uploads/1/3/5/3/135396878/tefokukaw.pdf
    • https://dezuvatag.weebly.com/uploads/1/3/4/6/134667454/7a168e2.pdf
    • https://cdn.sqhk.co/vesotadenogo/47lhcji/fall_guys_switch_crossplay.pdf
    • https://roriwemako.weebly.com/uploads/1/3/4/5/134599113/4241703.pdf
    • https://zufuleruzu.weebly.com/uploads/1/3/1/6/131637307/6279920.pdf
    • https://mobofapewapo.weebly.com/uploads/1/3/5/3/135399527/gibib-buwemezawotosug.pdf
    • https://cdn.sqhk.co/motulobugaji/ieUnSii/xatisobovuwotufe.pdf
    • https://cdn.sqhk.co/gagobuniponi/hePthfb/pumpkin_carving_kit_walmart_location.pdf
    • https://cdn.sqhk.co/vemonososepa/igwjagh/moveja.pdf
    • https://metasabuvaro.weebly.com/uploads/1/3/2/6/132681671/ropujelovuba-bozalijenuw-tifutikomu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pokorevalaxex/addresses_in_australia_format.pdf
    • https://uploads.strikinglycdn.com/files/b61e3ffd-0cc3-4d19-ae03-0b1a3500666b/aja_video_systems_ki_pro_ultra_plus.pdf
    • https://s3.amazonaws.com/vofadoloves/62469653585.pdf
    • https://s3.amazonaws.com/jukoxisojow/comtrend_ar-5381u_firmware_update.pdf
    • https://uploads.strikinglycdn.com/files/cadac437-dc4f-44f4-9180-d43cd8c809a2/96743989807.pdf
    • https://s3.amazonaws.com/mutirexa/misipodom.pdf
    • https://d572dbd6-ec42-402e-884a-3db6daac2318.filesusr.com/ugd/6a558d_d001c2018c5f4dafae565195b4dc9987.pdf?index=true
    • https://c480cc3d-c044-45b7-a7fa-747782367dcd.filesusr.com/ugd/a26f59_4597ed9b44c44c20b18044b33d064ff0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4c001f70-0f07-4ba0-b03e-8ae61adee3b5/71676370542.pdf
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_1838662a14654c3f8812052e52c3d8cf.pdf?index=true
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_b3bb55ace2564a1494599b27f77a0a9f.pdf?index=true
    • https://s3.amazonaws.com/vebisop/dyson_animal_hoover_spare_parts.pdf
    • https://uploads.strikinglycdn.com/files/87843342-fed8-479d-9942-7d88fbf0082b/korean_for_beginners_book.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecb3.bin
93607aa9588eb82c125aba53def6576b6685b957a87addf7123d3cee98b1b11b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECB3 5568 bytes
font_01_sfnt_off0000ffb6.bin
3a0ce33417c0dec9537f9471034ed499a699c8f4ec23ffd990e90ab3da080b56		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB6 10972 bytes

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