Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d4cd64a45a356f…

MALICIOUS

PDF

100.3 KB Created: 2021-04-14 05:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 95a381152f9735fabfb750aa5cab557a SHA-1: 5704c9ad46e569f3a2043c522f46c936644e378c SHA-256: e8d4cd64a45a356ffdeaffa96bab8153cd15f7a75f7a922264d4445aa58659d9
126 Risk Score

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 0.9991

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://nipisod.ru/strik?utm_term=what+are+the+scarce+resources+in+the+philippines PDF link annotation
    • http://about-fb-support.com/27652555299cjza.pdfIn PDF document text
    • http://eagleaff.com/wugijop4g8b.pdfIn PDF document text
    • http://tersq.space/xekijevoruwufikekuw6vyae.pdfIn PDF document text
    • http://teksol.xyz/78950906278fncqi.pdfIn PDF document text
    • http://probmake12.xyz/free_stress_balls_uk4ktce.pdfIn PDF document text
    • http://perfectiona.online/do_android_battery_calibration_apps_worksyc81.pdfIn PDF document text
    • http://spiritstudio.ru/how_do_i_change_the_waste_toner_boxgz34t.pdfIn PDF document text
    • https://cdn.sqhk.co/nenoserod/2jft4ij/balsa_wood_sheets_walmart.pdfIn PDF document text
    • http://instofficial.online/368559698716sfrb.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/uMjc7Q6/mathemagic_6_answers_online.pdfIn PDF document text
    • http://salonop.xyz/dulilu95dtq.pdfIn PDF document text
    • http://womenit.space/cd_booklet_photoshop_template9q5fo.pdfIn PDF document text
    • https://cdn.sqhk.co/muwazubivotu/Qha1Rje/davobekamewefuvazil.pdfIn PDF document text
    • http://appletopshop.ru/jozivis9a1.pdfIn PDF document text
    • http://oficialshoes.site/how_to_read_zener_diode_color_codem6qcf.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://makeyourself.xyz/45189407853ejrwn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_a6c6f4587f7244cd984176515324373d.pdf?index=trueIn PDF document text
    • https://065b66ee-25d8-4381-b309-094abc4d823c.filesusr.com/ugd/2703e6_3584e70d59704dcc8f1f58b7145224e2.pdf?index=trueIn PDF document text
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_cdccf1485b7044edad91b67a9694775c.pdf?index=trueIn PDF document text
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_97deaf5f1f7e4112b0e47e1e7e93d34b.pdf?index=trueIn PDF document text
    • https://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_9c6344d9572141208e74f107f14df1b6.pdf?index=trueIn PDF document text
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_6929f37f671a4aac9b0f2fc3735bd5c8.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13593 5032 bytes
SHA-256: fa7056a3eb9b16a5627ffc978ac96d99e5029a1849253b0b4dfbb216d42fc2f5
font_01_sfnt_off000146ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146BA 11784 bytes
SHA-256: 7d0073d20733234270f80d9b1c2b79228ee114e3f6de7cd56890ed234686a604
font_02_sfnt_off00016dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DC9 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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