Malicious PDF — malware analysis report

Static analysis result for SHA-256 e77a8f44f943375c…

MALICIOUS

PDF

84.3 KB Created: 2021-03-08 09:31:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e474fed902e3d9777656e57d62fc00f SHA-1: e91a7545195b2483d292ffb51034fd152e674039 SHA-256: e77a8f44f943375c87f838de0e8bb4edcf2d1f79539f905e11133e50745bf4af
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs point to suspicious domains, reinforcing the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/wix?keyword=python+vs+matlab+syntax
    • https://fumadutukit.weebly.com/uploads/1/3/1/4/131437402/tosoje_wexulada_wamajuluna.pdf
    • https://muxazufi.weebly.com/uploads/1/3/2/6/132683336/8770986.pdf
    • https://tibefuwejar.weebly.com/uploads/1/3/4/3/134332688/tirupopuk.pdf
    • https://lirukasuk.weebly.com/uploads/1/3/0/7/130739032/wowit-dipugexerijerud.pdf
    • http://fobexugelego.getenjoyment.net/2005_dodge_ram_1500_5.7_hemi_engine_diagram.pdf
    • http://lutafem.getenjoyment.net/jitudexejixazolosavamanuf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_548200efcf2f4d559461b52c1b173492.pdf?index=true
    • http://sokekakeloji.onlinewebshop.net/bamitafarun.pdf
    • https://uploads.strikinglycdn.com/files/75c3c3de-668b-4ea9-bf4e-0bf9935a9ab5/62553514488.pdf
    • https://s3.amazonaws.com/godoremitiwuja/58310414559.pdf
    • http://jezevenakos.myartsonline.com/sweet_clara_and_the_freedom_quilt_online_book.pdf
    • http://naxesabefadufu.atwebpages.com/how_many_magic_treehouse_books_are_there_in_all.pdf
    • https://s3.amazonaws.com/gekojulog/possessive_nouns_worksheet_for_grade_5.pdf
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_63dca975560e4426974d6d20a5774aa2.pdf?index=true
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_b946af43fad64dc8b312591db4abe02d.pdf?index=true
    • https://s3.amazonaws.com/naxozelozude/upsc_prelims_answer_key_2019.pdf
    • https://uploads.strikinglycdn.com/files/91987b99-ca3c-4cce-a7ac-31ece5853a26/taco_bell_power_bowl_nutrition_no_rice_no_beans.pdf
    • https://s3.amazonaws.com/rotowan/xobenekido.pdf
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_90c9ba62ce864114b2ab20a24d51caf1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/009904c9-3137-46e6-863e-36743b493b61/fanebevawep.pdf
    • https://s3.amazonaws.com/nupotukig/bal_brahmachari_video_songs.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_off00010d2c.bin
cfba2feba364a936755696a2fce8f01fbafa0e4f0d1650e971913691b04ece3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2C 5200 bytes
font_01_sfnt_off00011ec4.bin
b0235783f49b66633c65b71094eeb1c4e66680a73a2efd61be84cd0e832a4d29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC4 10900 bytes

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