Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5fb104411d6f4cb…

MALICIOUS

PDF

76.4 KB Created: 2021-05-16 22:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4f27e9e4558944dc9ce24d946f1e3009 SHA-1: e538a246c33c9caa1d99548abf549a3188c30505 SHA-256: d5fb104411d6f4cbd871790ba58166635c31ea9255d5869bdbd6baba98548f8e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gimoguvi.ru/strik?utm_term=kindle+fire+hd+10+operating+manual PDF link annotation
    • http://hdvideo.design/junoxitnafal.pdfIn PDF document text
    • http://themarkuzmusic.com/30854785928dlhgp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461746/normal_6042f0f56bb0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529697/normal_5ff07855add00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413850/normal_5ff0f69e2bff6.pdfIn PDF document text
    • http://creditscorerepair.info/wolufovorukvw51l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456687/normal_5ff828662d471.pdfIn PDF document text
    • http://persequen.com/falcon_bms_4.33_u2_downloadpztrr.pdfIn PDF document text
    • http://stnold.com/50474467702rrary.pdfIn PDF document text
    • http://wivaserana.mywebcommunity.org/ditepusulamagan.pdfIn PDF document text
    • http://biolinkus.me/54954408198wvkl9.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/saint_john_mba_program_letter_of_recommendation_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492918/normal_605c26b3a5f52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409796/normal_60647ed214c49.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426676/normal_5fdc95104c223.pdfIn PDF document text
    • http://heleogose.online/yamaha_moto_4_80_for_saleg6ozg.pdfIn PDF document text
    • http://latuha.com/argano_manuale_con_frenodjqjc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378155/normal_6022d24ec9b45.pdfIn PDF document text
    • http://gooddevice-online.com/flight_simulator_x_steam_system_requirementskk136.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vipinib/herbivores_omnivores_carnivores._oh_my_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/68131699483.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/mhf4u_trig_identities_formula_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/assistant_commandant_answer_key_2018.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_off0000ea88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA88 5440 bytes
SHA-256: 7f85d6dd70e04f5418ee13eb88e6362f223e43f85fb5d1859220f171d4f0e3ca
font_01_sfnt_off0000fcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEC 10968 bytes
SHA-256: 89463bfa32ce7e3133396c662c559855e6d231dab21472995041028129c2f34e

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