Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff68c37015898d3…

MALICIOUS

PDF

77.7 KB Created: 2021-03-18 19:56:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 68590562c4e9d38a991155792eab190b SHA-1: 235b1882406d1ee3198c75d8aa23f4ef5489a403 SHA-256: 3ff68c37015898d370acaad30974a956b70f3485595a99a28069f2d606abdc1b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://botokaw.ru/strik?utm_term=the+wild+unknown+tarot+deck+and+guidebook+keepsake+box+set+by+kim+krans PDF link annotation
    • http://siteznakomstv69.space/zotolumibidasek0qz1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495251/normal_5fcefc2c7b3ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385887/normal_6003d57a1a673.pdfIn PDF document text
    • http://usersonlineguardingsettings.site/save_bitmap_as_image_androidnoara.pdfIn PDF document text
    • http://letgtma.bid/audio-technica_at-lp60-usb_stereo_turntablemhngs.pdfIn PDF document text
    • http://pasiworuwiwoz.getenjoyment.net/spring_framework_tutorial_point_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477916/normal_5ff3adb76e578.pdfIn PDF document text
    • http://naturmilans.fun/73881541212r8uq4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374951/normal_604a8c0c15a59.pdfIn PDF document text
    • http://lorewipa.scienceontheweb.net/rockford_fosgate_p3001_price.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499309/normal_601d284337ba2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_3b3705b0e83e4ab2a4f6c635bee8aea2.pdf?index=trueIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_17446f1ef451466abad3d14550d1cd10.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ee47032-783a-4334-8be4-9551086cacab/zovaxamejotonenek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75ad74ad-cbb4-4bc7-8d55-ad863e2d8629/what_time_does_black_friday_start_at_walmart_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90adb143-6658-45dd-aa1b-18fb59aae13d/tupudikitabix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f582446-63c3-4b54-bab5-8c488c516c79/midizolujo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/485584a2-84b3-44da-bc6d-9f2b6eade71c/defining_and_non_defining_relative_clauses_exercises_intermediate_level.pdfIn PDF document text
    • https://5457524e-bace-410a-9ce7-c8d8bc0eedea.filesusr.com/ugd/f0ffd0_69b3bd476de747a0b45cf071f92b35fa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d69861a-1a54-4470-a290-6ea7e58edac0/31278575801.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9366db2d-8343-430e-b427-bcd68e94b2ea/xekipebukevilowuwadukid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b34ff297-9e5d-4f56-879b-6f4860303e60/how_to_clean_mr_clean_spin_mop.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C8 5900 bytes
SHA-256: 4a2267d11013a6582baaa6646d90e8a321258df0825d600f7a6b3b845aa29419
font_01_sfnt_off000104cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CF 10608 bytes
SHA-256: 4d441b885bb4d8071cde546bfb325cf7071502ef479bbac1ca7955664481397f