Malicious PDF — malware analysis report

Static analysis result for SHA-256 78121f4abdb9d2c1…

MALICIOUS

PDF

77.8 KB Created: 2021-03-12 20:50:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 261ca404c7974d26f5e692706ac5bb5a SHA-1: e0fc34deb1251098fe485126e05b9b6d6f3e674d SHA-256: 78121f4abdb9d2c1642bc004d81abefc2fd79d75e4ea079f96d57255961fa418
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 0.9998

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=diabetic+foot+guidelines+2019 PDF link annotation
    • http://fapadobitazi.22web.org/65941470718.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/naxizugenabi/cisco_2140_firepower_datasheet.pdfIn PDF document text
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_1db0a99f896c4b34adf9a659c10864d1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/najubu/77065229740.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e3f8f14-f818-47f5-a01e-9079e4f76402/45813470162.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0402d433-7663-44d2-a860-12dab08861bc/57395785114.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9d21462-2c98-4bf7-86f0-59a186e61de2/apple_ipod_nano_7th_generation_bluetooth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0e4cb15-a5ec-4001-937d-f5d566d068ac/71927890184.pdfIn PDF document text
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_3ace6de0a74846dc9ad10bf4fe74d16e.pdf?index=trueIn PDF document text
    • http://kejarajavamoge.epizy.com/freelance_contract_agreement_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4565b3f0-9209-48c0-804c-c8c4a2d2a1da/what_to_eat_on_bright_line_eating.pdfIn PDF document text
    • http://dejenirapavo.rf.gd/57963415229.pdfIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_507b7aa0a547426d8b112b05a2a82437.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/76445855529.pdfIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_4690076209fa4d8187c0c3052f188d45.pdf?index=trueIn PDF document text
    • http://vipesuno.rf.gd/bailey_and_love_latest_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92481cd4-674e-40fb-8d5b-c6cbaf117068/63884078618.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_off0000f133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF133 5716 bytes
SHA-256: ab952b72c9ededa568901395fb28de4d2d16c5b5d33f505c3a89a5b359b92527
font_01_sfnt_off000104c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C1 10848 bytes
SHA-256: be6bc28af329e43359d2b1349ba27a5fdfdaec0be781da48fd321130cde6e34b

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