Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e191cf2d3703661…

MALICIOUS

PDF

77.5 KB Created: 2021-03-12 07:15:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 537fee055d161f1fb3f20faad755f4e6 SHA-1: 2b741022fbab667a77da30e9ff54f346a91256a8 SHA-256: 9e191cf2d3703661a1ffcc479c07d5c98dd3537ad21790c9967044d4129c92f2
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically 'Pdf.Phishing.Trojan'. While no scripts were directly extracted, the presence of numerous external URLs suggests an attempt to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://druttle.ru/award?keyword=nervio+hipogloso+pdf
    • https://static.s123-cdn-static.com/uploads/4421782/normal_5feb845458e4b.pdf
    • http://fejekadiwoxobiz.getenjoyment.net/kafin.pdf
    • https://static.s123-cdn-static.com/uploads/4384150/normal_5fc93f2b1a102.pdf
    • http://lnstagram-office.com/organic_chemistry_1_questions_and_answers6812w.pdf
    • https://static.s123-cdn-static.com/uploads/4417226/normal_5fc9ec92ee17a.pdf
    • https://cdn-cms.f-static.net/uploads/4388824/normal_602290e4d3b81.pdf
    • https://cdn-cms.f-static.net/uploads/4449774/normal_5fe78e00991f9.pdf
    • http://damvglaz6.xyz/dyson_dc59_battery_flashing_blueawy3o.pdf
    • http://greatmasters.biz/adjectives_comparison_exercisesdueg3.pdf
    • http://razvivatel.blog/654585060545ig7t.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/resabomibogodaw/is_30_mbps_fast_enough_for_zoom.pdf
    • https://s3.amazonaws.com/getizar/nurse_uniform_store_pensacola_fl.pdf
    • https://s3.amazonaws.com/zuwosil/volume_of_rectangular_prism_worksheets.pdf
    • https://s3.amazonaws.com/dojivewobasuval/intellectual_capital_reporting.pdf
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_5f7fb8fd7f784187b314b065b7f36991.pdf?index=true
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_f721d73140df4ace8e387a59624b8a1c.pdf?index=true
    • http://jafixomedimun.onlinewebshop.net/tusofisewos.pdf
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_d279e73209a54d848ff67bcfb31278a9.pdf?index=true
    • https://s3.amazonaws.com/pulujolatepuv/hallelujah_song_sheet_music.pdf
    • https://s3.amazonaws.com/vebenok/pepilowaloxadomimowolilo.pdf
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_10038fc9e6c8450b824950e569eea8f1.pdf?index=true
    • https://s3.amazonaws.com/zarusegibitumet/e._i_report_sign_in.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_off0000f086.bin
17cd51f58ed436fd2261c5c206f86f9fa8597b92a3a432e27a2f118cf651a3d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF086 5120 bytes
font_01_sfnt_off00010202.bin
94ec20271902b93c4601184a98b4f5093cfe8e9af650397fa31d4cfde0e12233		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10202 12080 bytes

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