Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb8ca0dbc0c0c680…

MALICIOUS

PDF

77.3 KB Created: 2021-04-01 03:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6a60064735aec6730b64852d9095e6f SHA-1: 780182368508086104844cb7ca93436ee0056aea SHA-256: cb8ca0dbc0c0c6807e2908faf75bb8650d70afcbc342dc5992a1f9ce7edec0d5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to obscure domains, indicating a link farm or SEO abuse tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kuzutuzo.ru/wix?keyword=words+with+c+in+them
    • https://bawefuravejegi.weebly.com/uploads/1/3/1/4/131438418/f44c8.pdf
    • https://zadilomevesijob.weebly.com/uploads/1/3/4/5/134581884/nopuw_vozefadisivo.pdf
    • https://kagejiwuj.weebly.com/uploads/1/3/4/0/134095923/548ffa3cc99e.pdf
    • http://dirozigumifew.scienceontheweb.net/satowumonezopigezepiver.pdf
    • https://darojavanobize.weebly.com/uploads/1/3/4/8/134889586/fetoso.pdf
    • https://zavisedifigi.weebly.com/uploads/1/3/4/3/134316550/e3e3f3.pdf
    • https://vubumixot.weebly.com/uploads/1/3/4/7/134751696/632700.pdf
    • https://zapowiwowo.weebly.com/uploads/1/3/0/7/130776131/vawimiv.pdf
    • https://noparerekum.weebly.com/uploads/1/3/4/6/134639333/8050529.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bezegoluzose/the_devil_is_a_part_timer_ending_song.pdf
    • https://s3.amazonaws.com/gizonukorad/74521110693.pdf
    • http://mubodadekutaxim.atwebpages.com/camera_angles_in_film.pdf
    • https://s3.amazonaws.com/zukogi/18721788651.pdf
    • https://s3.amazonaws.com/tubupejevomo/additive_manufacturing_gibson.pdf
    • https://s3.amazonaws.com/penefelomiju/free_children_s_christmas_carols_songs.pdf
    • https://s3.amazonaws.com/voxipanovigepiv/5487974430.pdf
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_50d0fcc2785346c29100e2c5146cb11f.pdf?index=true
    • https://s3.amazonaws.com/xabalaru/eternal_card_game_puzzle_guide.pdf
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_e2b413d40aec43a3a2b98989028dc1f0.pdf?index=true
    • https://s3.amazonaws.com/jixeremipet/charisma_bed_sheets_costco_review.pdf
    • https://s3.amazonaws.com/lodazojamuva/28300910285.pdf
    • https://s3.amazonaws.com/tipikaxe/2928344799.pdf
    • https://30cc9e9c-6145-4029-bfdc-d0561bdb3a10.filesusr.com/ugd/0dcf4b_db309779c88b4fe5ac1b1f677b85d508.pdf?index=true
    • 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_off0000f26b.bin
9f86fc647f60b71f0b097e3e97316a15801de0429481218e7a207c7418bf9625		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF26B 5040 bytes
font_01_sfnt_off00010381.bin
e8e8dde3d7288fe2dffb92c7dde0d5e066334f1acf88881c24037c9da74d6136		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10381 10684 bytes

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