Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c439a3ebea4f8ff…

MALICIOUS

PDF

81.2 KB Created: 2021-04-01 02:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04f9d8a371644a632e4b4f42825338a7 SHA-1: 754f561465b04ca77450f092df02666906004537 SHA-256: 1c439a3ebea4f8ff47079e88767ce581e4a51fc8a6720c5426d344f01b14767e
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 hosted on dynamic DNS services or appear to be part of a link farm, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/award?keyword=walter+isaacson+leonardo+da+vinci+book+pdf
    • https://cdn.sqhk.co/zadorari/kgjBmij/bikopafunitinigugu.pdf
    • https://cdn.sqhk.co/xopuwatipo/hijjggo/music_lab_song_maker.pdf
    • https://cdn.sqhk.co/sikudile/Pgf3jab/19515520161.pdf
    • http://reduslim-shop.website/dopopodukb66e.pdf
    • https://cdn.sqhk.co/jopuromug/N2jjgeu/fasubipexixapo.pdf
    • http://maykistore.ru/14549973148bqjz6.pdf
    • https://gomopurijovovuj.weebly.com/uploads/1/3/5/3/135390772/poxala-danofojutol-bozusutazobefi-supavulemaw.pdf
    • https://cdn.sqhk.co/vamapoludi/msjgieK/download_tik_tok_video_without_watermark_ios.pdf
    • https://cdn.sqhk.co/dodirorip/hbZibjd/chamara_weerasinghe_best_song_collection_free.pdf
    • https://cdn-cms.f-static.net/uploads/4380863/normal_60624be9ee274.pdf
    • https://static.s123-cdn-static.com/uploads/4373239/normal_60066d99c846d.pdf
    • https://cdn.sqhk.co/gojikanemiju/TifCghg/waxoninifabanopaxib.pdf
    • http://comp-arenda.site/706760231622djo6.pdf
    • https://cdn.sqhk.co/wesebewoweva/ih1agf5/34691908582.pdf
    • https://cdn.sqhk.co/nobutowug/hcif7dT/one_gold_app_review.pdf
    • https://cdn-cms.f-static.net/uploads/4470038/normal_5fe8c43fb02cc.pdf
    • https://cdn-cms.f-static.net/uploads/4485299/normal_60614319e5175.pdf
    • https://wetolobumusu.weebly.com/uploads/1/3/4/5/134579125/7090331.pdf
    • https://cdn.sqhk.co/nopavoboriru/icjfAha/find_my_phone_location_history_iphone.pdf
    • https://cdn-cms.f-static.net/uploads/4413850/normal_5fe973bbb6147.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000fdaf.bin
501e94e796576ea8f8cf90292ecedb2c38cea98e9a39fe537bcd1971664fb7b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAF 5424 bytes
font_01_sfnt_off00011041.bin
a5ee5fe664d2228c04bf652894f2367a2f6002d77e379308017558d0d81e9796		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11041 11616 bytes

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