Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7efd023136cd1db…

MALICIOUS

PDF

73.6 KB Created: 2021-03-13 15:57:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 353eb3a345e5e4be47854bbd7526c310 SHA-1: 9e9fdf0b22cff3f7d03cd4d80255cba6c5dd038a SHA-256: c7efd023136cd1db2d41ec6737760e88ca4c1f71db7cd645cc6da2f25c0640a0
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 0.9997

Heuristics 5

  • 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://kuzutuzo.ru/aws?utm_term=how+much+is+the+salary+of+an+engineer PDF link annotation
    • http://davupopebuwiser.sportsontheweb.net/blade_450x_helicopter_for_sale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388157/normal_600fac02772fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368964/normal_5fcfe8167f09e.pdfIn PDF document text
    • http://puruzil.iblogger.org/family_feud_game_rules.pdfIn PDF document text
    • http://vomimaforotagi.mywebcommunity.org/what_is_the_hardest_word_to_guess.pdfIn PDF document text
    • http://sasawavivar.mygamesonline.org/electronic_cargo_tracking_system_zimbabwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379970/normal_60152a0e96bbf.pdfIn PDF document text
    • http://fagogit.sportsontheweb.net/3d_shapes_worksheets_grade_3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3a7b682b-4b85-4b21-836a-a34929c8735b.filesusr.com/ugd/0cd3a8_2fdaa93079264727ab544cd2182c41fc.pdf?index=trueIn PDF document text
    • http://pukerobedu.epizy.com/cdf_from.pdfIn PDF document text
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_fc2a682dc29a4c2fb172468266eeb5b4.pdf?index=trueIn PDF document text
    • http://rajamuviw.epizy.com/bolne_wali_billi_ka_apps.pdfIn PDF document text
    • http://bavejoxobev.epizy.com/what_is_median_income_in_india.pdfIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_3e7dedd8884d4e0ca76355c3be47cf09.pdf?index=trueIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_6ad50006445846aca3604523cfe6402a.pdf?index=trueIn PDF document text
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_269336c5d6534677bfcb044e784ac812.pdf?index=trueIn PDF document text
    • http://lipidojomodu.rf.gd/82506448675.pdfIn PDF document text
    • http://rigirulame.epizy.com/holt_mcdougal_geometry_answers_page_25.pdfIn PDF document text
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_bca8712c1edb4c51ac44d13a6275d647.pdf?index=trueIn PDF document text
    • http://kigetivizaru.epizy.com/present_perfect_tense_practice_worksheets.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_off0000e332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE332 5448 bytes
SHA-256: f794593adc8a8d47fd3c3289773ad6a364064113b26c5e75d8f1931d14a577f6
font_01_sfnt_off0000f5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AC 10220 bytes
SHA-256: 1a1e55f0309de483c6fabff6258e708c00494738a762370e33d5b365e0410dc5

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