Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f61528f1df295b…

MALICIOUS

PDF

76.4 KB Created: 2021-03-14 19:33:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8716fb6658f2bb4929bf38ac027c7a99 SHA-1: 77cc8975491409f2255ba946bd44bd30b8b1e4bd SHA-256: b3f61528f1df295b4a3eaea8088d23663a487188d2bf854b6cd3146d533bfa59
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to direct users to phishing or malware-hosting sites. No scripts were extracted, but the presence of numerous external URLs is the primary indicator of malicious activity.

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
  • 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://leonvi.ru/wix?keyword=platformism+vs+syndicalism
    • https://dubelaxelafef.weebly.com/uploads/1/3/1/1/131164372/6565810.pdf
    • https://cdn-cms.f-static.net/uploads/4463560/normal_5fdc60e0132e9.pdf
    • https://dubasebajulux.weebly.com/uploads/1/3/1/3/131382081/1f841.pdf
    • https://cdn-cms.f-static.net/uploads/4365662/normal_5fdc31cf57ec1.pdf
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/xifibej_nesokogivema_miwubexeziri_zizorabika.pdf
    • https://rexizoxulod.weebly.com/uploads/1/3/5/3/135399206/sokexasuwik-tikenavofef-mijewewop-jejopi.pdf
    • https://cdn-cms.f-static.net/uploads/4382414/normal_6035305e3a2ca.pdf
    • https://cdn-cms.f-static.net/uploads/4409610/normal_60391e4892513.pdf
    • https://cdn.sqhk.co/zowolanazew/jeicMhg/document_scanner_app_for_cam_scan_free.pdf
    • https://cdn-cms.f-static.net/uploads/4375521/normal_5fd5fd4e59b73.pdf
    • https://cdn.sqhk.co/tidaxetosi/eytidih/guxujezuwujo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://80c8fd16-4cf8-4f9f-b52b-d6c956df8f3b.filesusr.com/ugd/1a94e8_f0848d4f12a14eacbd489f38631eaab3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b72c3632-ef6f-4b15-af58-edbb80121a9d/1_de_novembro_feriado_em_que_paises.pdf
    • https://c140f178-ee45-427e-91fe-a3c5f821f67e.filesusr.com/ugd/ebc5f9_ddd0055986e44a20ab12c577a2b14f37.pdf?index=true
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_8a447c6afa40475f809b51c9095b9417.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bd28af18-cf63-4d47-a320-b386f550f3ef/81176450341.pdf
    • https://uploads.strikinglycdn.com/files/554d1f92-f489-4010-a1d2-cef03c9e14e1/14-1_law_of_sines_practice_and_problem_solving_a_b_answers.pdf
    • https://uploads.strikinglycdn.com/files/4f1179de-c56e-4cf3-ad95-0eeb221284fd/winning_the_losers_game.pdf
    • http://banafosas.epizy.com/48208360479.pdf
    • http://xoxibejumas.epizy.com/comentario_texto_argumentativo.pdf
    • https://f77c8dad-41d7-4a8f-8d8d-c05149a3a236.filesusr.com/ugd/36d413_cdc4278b97754252911a627fd5d00012.pdf?index=true
    • https://uploads.strikinglycdn.com/files/32dc2480-1e77-4e77-af6c-00e33221c271/detopotemunaguwaxa.pdf
    • http://rafotafu.epizy.com/tamil_album_songs_tamilrockers.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_off0000edc3.bin
b9fa517b42267dbea13d63e51374274877ce9875ccf6cc462bb938b4c8946329		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC3 5332 bytes
font_01_sfnt_off0000ffde.bin
f2cfd9342ddc01337a920210ca96a8e6dc0266b34147f24f8f0d6c7ff291067f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDE 10748 bytes

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