Malicious PDF — malware analysis report

Static analysis result for SHA-256 e97b9928b4de98b9…

MALICIOUS

PDF

80.2 KB Created: 2021-03-20 11:21:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87924ad649a14df4b4bb632e34185544 SHA-1: 7b10ae422f36c055508dffa8a6e5294d530d8ade SHA-256: e97b9928b4de98b975c8ce322efe04d895a68ead0ccd1aef956b821072f1e887
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, with one heuristic specifically identifying a 'link farm' designed for SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated, but the presence of external URIs and the 'Password-protected archive handoff' heuristic suggest a multi-stage attack where the PDF acts as a lure to obtain a password for a subsequent malicious archive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://dafemum.ru/strik?utm_term=jose+emilio+pacheco+el+principio+del+placer+pdf
    • http://ig-support-service.com/90954356776mithi.pdf
    • http://azorocheat6.xyz/fapobolakakinonixe79ilm.pdf
    • http://zespodsvetkoy.site/87386989104lv4f1.pdf
    • http://fenuxove.22web.org/cub_cadet_lt1045_rear_bagger.pdf
    • http://info-pages.ru/hollow_knight_how_to_get_double_jumpy2jfe.pdf
    • http://maxist.ru/943972770441rjn3.pdf
    • http://zumufaxe.iblogger.org/klein_tools_mm2000_battery_replacement.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_0f411bd49d014ddf96fa503504e45060.pdf?index=true
    • http://sisawujeza.rf.gd/36040184969.pdf
    • https://uploads.strikinglycdn.com/files/1578c6f7-fe5b-4613-b7f6-5a9e6406a3f4/mq_error_code_2538.pdf
    • https://uploads.strikinglycdn.com/files/6a4459d0-62c7-4d9f-a514-8530296bc48d/malanazujabamorumota.pdf
    • https://uploads.strikinglycdn.com/files/48b12e8c-266f-44b0-be7c-a46297982be7/vuzupijitijopogapu.pdf
    • http://nifekubipaxo.epizy.com/400587924.pdf
    • https://uploads.strikinglycdn.com/files/bf402dc1-5b3f-4744-8399-4944f8e98ac4/towupadoserewepuxajibepu.pdf
    • https://uploads.strikinglycdn.com/files/47db8b9d-2ae2-45a6-961d-3e5c4e230a1e/star_trek_discovery_season_4_filming_locations.pdf
    • https://uploads.strikinglycdn.com/files/10cbf412-4c88-4f2e-bd54-c2b435b1fea3/nuxovinirujasop.pdf
    • https://uploads.strikinglycdn.com/files/10bf471e-70ad-4e7c-b51b-df7337b68ee0/kuxozanigize.pdf
    • http://bexinoj.epizy.com/kagozupeja.pdf
    • https://uploads.strikinglycdn.com/files/43063f8d-5a57-4b3e-ae0b-ca236f11d83b/sezotoremugedosel.pdf
    • http://gawuvuv.epizy.com/subordinating_conjunctions_list_with_examples.pdf
    • http://wegoxoxajenugol.rf.gd/19459374297.pdf
    • https://uploads.strikinglycdn.com/files/ed9b134b-3bb2-4cff-9c2b-3a3c38e45b23/whirlpool_dishwasher_wdf320padw1.pdf
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_e33c6b0392c0444ca031cb5f00388959.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c8ba6bf1-a907-43a4-8f47-7782d7eea402/mg_gramos_equivalencia.pdf
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_db76c6c3c7354d38be7432eea793780e.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_off0000f751.bin
923dbf24ac3c77b1c07a5b4b9800f7245d6cc0c2c30cf8f306eef5892c93ffe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF751 5384 bytes
font_01_sfnt_off00010970.bin
2bb03f612f51577a769d67b565fe01b8c276a093faaa30aea182fcac842c450b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10970 12212 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.