Malicious PDF — malware analysis report

Static analysis result for SHA-256 565920af125897b1…

MALICIOUS

PDF

78.5 KB Created: 2021-03-17 11:34:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46a9bafd61736e714f21fdf9ef21ba8a SHA-1: 5d5aa638d5f95695e0776b7a07d32671d6095740 SHA-256: 565920af125897b1122b72cc6b4df8d69ab56be6274a38b9751d251d0d01f18d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to suspicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=andyroid.+net+free
    • https://molusodufewi.weebly.com/uploads/1/3/4/4/134465793/1c34a39384011.pdf
    • https://loseseseveru.weebly.com/uploads/1/3/0/8/130813975/zuladen_palajowedomuna_gosadinej.pdf
    • http://pasikufopubiwo.mypressonline.com/veeder_root_tls_350_paper.pdf
    • https://cdn.sqhk.co/saboxiwago/ghaKWV3/marifigesoranomozotep.pdf
    • https://cdn.sqhk.co/logulemuset/ljgAIKN/formula_1_racing_video_game.pdf
    • https://cdn.sqhk.co/xukigipeduve/gcAWAep/iron_man_android_game_1._6._9.pdf
    • https://cdn.sqhk.co/tamejenonisi/gj1Bjg5/sabibiz.pdf
    • https://lirupije.weebly.com/uploads/1/3/1/6/131606624/femadipez-musesafi-zemavijorexis-midivikejaluz.pdf
    • https://cdn.sqhk.co/putizimetiwe/ViaOFid/free_3d_wallpaper_for_android_phone.pdf
    • https://cdn.sqhk.co/kakapoxavu/DiiS2ig/colouring_book_brawl_stars.pdf
    • https://fometixivoros.weebly.com/uploads/1/3/1/6/131637143/b6c44a0218.pdf
    • https://cdn.sqhk.co/zimuteraf/eB9tjel/kefozolo.pdf
    • https://xisiwazebisa.weebly.com/uploads/1/3/4/7/134758569/gigojijalifegipulori.pdf
    • http://zimezobot.getenjoyment.net/4550850255.pdf
    • https://cdn.sqhk.co/togixulala/gggiger/bupawiwalajoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9e3a744e-71c5-4c76-8076-2a13f0b8260e/mythbusters_scientific_method_practice_sheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/b84b39e4-96e7-48a4-a037-1475282f383f/74615511361.pdf
    • https://uploads.strikinglycdn.com/files/5be02b49-7469-456b-adae-5f76dc70cec7/xeberuzowavijusitojuv.pdf
    • http://lijowavatajo.myartsonline.com/vifesebad.pdf
    • https://uploads.strikinglycdn.com/files/ae371846-0804-4420-b994-d2a27c9b00b7/what_does_the_word_digital_divide_mean.pdf
    • https://uploads.strikinglycdn.com/files/0f629c3d-ba87-47f5-be3b-1c7a47584699/84678607959.pdf
    • https://uploads.strikinglycdn.com/files/65778641-f6a2-4621-8630-236ab29f4627/91493027785.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_off0000f00e.bin
6bc3485d7d1e0a550c7bd163feab75ff85e07a153f4e33a9b078ecca2f998b35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF00E 4604 bytes
font_01_sfnt_off0000ffd8.bin
b88faba22e97cf979e6921a3d1ae46121ae0fb2b01563230be5936d3929f03a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD8 13844 bytes

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