Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf661c42f639dac…

MALICIOUS

PDF

77.9 KB Created: 2021-03-18 09:04:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e6a7d5350c6796768bec0d73e121172e SHA-1: dcbce18650aeb524419681cf55cf37e803e3a5a9 SHA-256: ccf661c42f639dac3ac359ab37128da8bb3e1bebb89514c2ffcf963b3c4569a1
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely to phishing or malware sites, disguised as calligraphy worksheets. The embedded URL 'https://ponafet.ru/123?utm_term=blackletter+calligraphy+worksheets' directly supports this lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/123?utm_term=blackletter+calligraphy+worksheets PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4456116/normal_5fe0d0993f983.pdfIn PDF document text
    • http://nipizakevenuvis.scienceontheweb.net/10_steps_to_successful_breastfeeding_ppt.pdfIn PDF document text
    • https://cdn.sqhk.co/ranetixeba/eheNC5d/apple_game_for_cats_online.pdfIn PDF document text
    • http://mapugukabazewu.scienceontheweb.net/bsc_interior_design_salary_in_dubai.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383794/normal_600e4c78994a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470526/normal_604961c073b18.pdfIn PDF document text
    • http://avtoshkola-region26.ru/wikamovejonoib4.pdfIn PDF document text
    • http://antonioit.fun/57440533172or0dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377642/normal_6036cd83276ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366063/normal_601bb38f7897e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504641/normal_5fe86918e29ec.pdfIn PDF document text
    • https://cdn.sqhk.co/medujebukoma/jbGQ4rq/wemebetajepaloroxubumuxex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369933/normal_6017010c3751c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_d0592a0ca515452babcca6e012059d39.pdf?index=trueIn PDF document text
    • http://zuzopejorexa.onlinewebshop.net/femeri.pdfIn PDF document text
    • https://33fe1336-4051-433c-b691-b763732126dd.filesusr.com/ugd/6c8f37_03cd14d330af4573b511a8bed8c09e12.pdf?index=trueIn PDF document text
    • https://944456f3-75eb-4cd6-bbfd-656b3713ada1.filesusr.com/ugd/2c8d66_28ef8640de14410b8ac006a559c0bc64.pdf?index=trueIn PDF document text
    • http://wovibojo.onlinewebshop.net/graphing_parabolas_worksheet_algebra_2.pdfIn PDF document text
    • https://5d3a357a-25b2-4459-9cd8-210b235f7b36.filesusr.com/ugd/45e30f_76c13b5af64c499f820e8eb1b8deb8a9.pdf?index=trueIn PDF document text
    • https://6bc553e5-d0de-4278-827a-c77c8eb32fbd.filesusr.com/ugd/4a6c57_cb2431c132484a618ecf523580d99a48.pdf?index=trueIn PDF document text
    • http://jeximojela.myartsonline.com/xinebisure.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE808 5500 bytes
SHA-256: 41c44ce9d91423f5e022016bf26489d36bc5dcaa8b1ee7045acefb52d14019ad
font_01_sfnt_off0000fad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD1 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off0001035f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035F 10976 bytes
SHA-256: f5687b0d258d80b7e44fe5dd2265f5174be987db64edd66178b918f62e950133

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