Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8f3af4bd483469…

MALICIOUS

PDF

77.8 KB Created: 2021-04-27 00:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1be9f89127ed8c1256bd4ba35266f240 SHA-1: e99d542fd157e01628238a8687710399b1adb8bf SHA-256: 0b8f3af4bd483469b7cd1771034e21e9f55a492163e444322f78327418f35ffd
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 dynamically generated or use common SEO link farm patterns, indicating a phishing or malicious content distribution attempt. ClamAV detection and ML classification strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards a phishing or malware distribution scheme.

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://pelibifir.ru/strik?utm_term=descargar+el+talmud+en+pdf
    • https://cdn.sqhk.co/xetilibul/duKtd61/download_badminton_league_mod_apk_2020.pdf
    • https://cdn-cms.f-static.net/uploads/4366652/normal_5fe801f7f4026.pdf
    • https://cdn.sqhk.co/lewonuvaxu/jjJhhge/good_captions_for_fb_pic.pdf
    • https://cdn.sqhk.co/sibamoxa/gajgjjw/muslim_day_today_2019.pdf
    • https://cdn.sqhk.co/vopupevomate/iThfTgg/24077503634.pdf
    • https://cdn.sqhk.co/ledusefugize/gir0OCx/wumeloz.pdf
    • https://cdn.sqhk.co/nanagajog/hiSjogj/jamedikerag.pdf
    • https://cdn.sqhk.co/zoxowowi/gijeghA/torezidupomivas.pdf
    • http://xarusogu.22web.org/85525350154.pdf
    • https://static.s123-cdn-static.com/uploads/4381788/normal_6005c4aad95fd.pdf
    • https://cdn.sqhk.co/xivovido/PTjj3lq/aesthetic_lockscreen_anime_wallpaper_iphone_xr.pdf
    • https://cdn-cms.f-static.net/uploads/4421342/normal_60653d08ab47e.pdf
    • https://cdn.sqhk.co/fenazijeguk/gege5hf/logo_quiz_level_214.pdf
    • https://cdn.sqhk.co/guzowozuk/ogdheic/sufipodimuwejubevojovi.pdf
    • https://cdn.sqhk.co/puvegipuros/Glrtmgc/square_bird_play_free_online.pdf
    • https://cdn.sqhk.co/lowanivari/jaHqMjd/business_continuity_and_disaster_preparedness_plan_template.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://233b4d2f-9c44-4004-b776-098ebc281e6f.filesusr.com/ugd/7f980c_ff67cc8b892d43c9883bce42a2bcefd9.pdf?index=true
    • https://46ebecaa-9490-439b-bba6-ee77f1a6ca93.filesusr.com/ugd/cee8a1_e6570895c5f74b46bd7ddd85c07add5c.pdf?index=true
    • https://63d876aa-455f-4c41-9c38-50747f3e0b95.filesusr.com/ugd/a220d5_d8c7c46cd0864b3a8376eac08e328b2e.pdf?index=true
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_35f0e13cea1140ea95a1c97245354f76.pdf?index=true
    • http://pajiridi.rf.gd/graphic_design_free_download_mac.pdf
    • https://63dbeab4-18c6-4677-a808-17cd77aec119.filesusr.com/ugd/963d80_8ce9cd75158d455caba79d863d79a5cd.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_off0000efba.bin
6b75b13f1041872c77d83c8306d4ffbbf738a2620d53065667ab08d7dce97300		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBA 5476 bytes
font_01_sfnt_off00010249.bin
21d338da5de592d1d80c7af57d55df909f493b3b11e5294d29719077bede6027		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10249 11636 bytes

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