Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9dfc79d5903cf9…

MALICIOUS

PDF

80.9 KB Created: 2021-03-31 21:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c69dd3bb7d13c2542bc91f5190e1d0e6 SHA-1: ed96a9f73b94f944b0c22caa9d3916d0410d63d4 SHA-256: cf9dfc79d5903cf91fcea7cdcf7bcb4a5c4364e3fd6beca889db1868cb1fae78
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It contains a large number of external links, suggesting it's part of a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated, but the presence of embedded URLs and the heuristic findings point towards an attempt to trick users into visiting potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://zajinet.ru/award?keyword=ccna+200+125+pdf+sybex
    • https://davijonixumitu.weebly.com/uploads/1/3/5/3/135349017/nubadamepiduxomipuvo.pdf
    • https://static.s123-cdn-static.com/uploads/4416932/normal_5ffa00fb96078.pdf
    • https://cdn.sqhk.co/bitaxukezor/3ggImhi/movijizamebomudulidim.pdf
    • https://cdn.sqhk.co/ronelejibir/1ohajgA/light_up_snowman_tree_topper.pdf
    • https://cdn.sqhk.co/bulixanejad/ghihVgg/80s_tamil_songs_download_zip_file.pdf
    • https://static.s123-cdn-static.com/uploads/4465128/normal_5ff5500b6c062.pdf
    • https://static.s123-cdn-static.com/uploads/4450896/normal_60014db1ba968.pdf
    • https://dafelubuvotaxid.weebly.com/uploads/1/3/4/7/134753950/fc78643d7df.pdf
    • https://cdn.sqhk.co/mexovaru/ehigf4k/16955644877.pdf
    • https://cdn-cms.f-static.net/uploads/4448743/normal_602231a058e4f.pdf
    • https://pedumodab.weebly.com/uploads/1/3/1/6/131637036/1390804.pdf
    • https://jotavitot.weebly.com/uploads/1/3/0/7/130738821/de606554b4e0.pdf
    • https://cdn.sqhk.co/rumoligodo/5frUibv/xuxoxan.pdf
    • https://cdn-cms.f-static.net/uploads/4370092/normal_6049026bc841f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rekawexuretowo/28926172120.pdf
    • https://uploads.strikinglycdn.com/files/7230887f-fd79-41a0-9ca5-af997b65d2fb/what_is_basic_calculus_all_about.pdf
    • https://uploads.strikinglycdn.com/files/e5021e9d-9278-414c-8148-6fc9449f0fb4/what_does_it_mean_when_your_keyboard_wont_type.pdf
    • https://s3.amazonaws.com/xisefowu/vovaf.pdf
    • https://uploads.strikinglycdn.com/files/8bad5ee0-72d4-40b0-b881-f67b816d2a3a/79903324774.pdf
    • https://s3.amazonaws.com/pizivurapab/the_dark_knight_strikes_again.pdf
    • https://uploads.strikinglycdn.com/files/4dc10688-2257-4b52-8471-b76872142951/wizard_leveling_guide_ragnarok_transcendence.pdf
    • https://uploads.strikinglycdn.com/files/ba644ff4-dabc-4a4f-830c-242048e98013/75819665712.pdf
    • https://uploads.strikinglycdn.com/files/d7d862b5-9990-4eb6-8c7e-f5968fa8f897/26214548810.pdf
    • https://uploads.strikinglycdn.com/files/aa7be849-e6ed-4181-bdde-c10f072b349c/vitox.pdf
    • https://s3.amazonaws.com/fezenur/jononevoxobowarigujegab.pdf
    • https://uploads.strikinglycdn.com/files/ab80973d-4cdd-4747-a373-db41190db3ad/31192123710.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_off0000fcbe.bin
805acb7bc044b1d6e7ea0e79bfdd00c02cfb7f7abe4d874b26997b1566dda412		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBE 5688 bytes
font_01_sfnt_off0001103f.bin
c9c68efd7e4d6026f46fe87757a04770153487c609ae9d351916d3030e3eb73a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1103F 11292 bytes

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