Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3c9581a82ff212…

MALICIOUS

PDF

103.8 KB Created: 2021-03-29 22:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4124bef199b4ad425c4a4aef1d897c90 SHA-1: 5adae4c4e52daaf97647861581ac69a90756fcba SHA-256: 4a3c9581a82ff2128705f1101759bc904a8ec64239dbf9bcdbd36ba64ccd1b7a
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-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://resalured.ru/wix?keyword=ashbory+bass+for+sale PDF link annotation
    • https://dakikizubebara.weebly.com/uploads/1/3/4/8/134889455/zexolemenofase.pdfIn PDF document text
    • https://matixibufi.weebly.com/uploads/1/3/0/8/130873880/4336d2cf6c46.pdfIn PDF document text
    • http://sodaapp.club/tanazizilokoxirolesuzuwi9k5.pdfIn PDF document text
    • http://dombitarf.ru/rare_infectious_diseases_list7pdt8.pdfIn PDF document text
    • http://good-production9.site/susofozuvogulow9ln2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/42d57f6d-8025-4f8d-bae0-7d418ed52941/why_is_my_led_light_remote_not_working_govee.pdfIn PDF document text
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_7119481b68ee4930a8d496905e849d90.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd7f520c-fc20-4788-bd41-d194faf5d710/head_of_roman_patrician_time_period.pdfIn PDF document text
    • https://3ecb585b-79b8-4502-8567-d9a17299c5c1.filesusr.com/ugd/4b874d_31faeddadca14869975130be008b5f92.pdf?index=trueIn PDF document text
    • https://6c892e0d-5736-4b4a-96a3-cd490fd1fe3d.filesusr.com/ugd/1407cd_40d5de4ccb674db7ab31cf12ab817537.pdf?index=trueIn PDF document text
    • http://jerananixakuzeb.epizy.com/aprilia_rs4_125_performance_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a76cf2c0-86c5-4a69-9be6-665d17e6da3c/foririgubed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a64c113-71eb-4b90-92df-206eedb38633/what_is_the_problem_in_the_call_of_the_wild_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f52bdf65-4cf7-43f5-b38c-6fdb6c68dd7c/xovewerulovimegefolodul.pdfIn PDF document text
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_7fea5bb8310f42d9b2c111d052424858.pdf?index=trueIn PDF document text
    • http://vetanafajodomek.epizy.com/averages_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71d77770-3bbb-488d-ba78-1e45698d0c0c/52969082352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b38dbe83-d2c2-465d-920b-b1298decfe61/computer_networking_course.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_off00015a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A19 5088 bytes
SHA-256: 597063eb9d31cc57e323782793e597b4a39309427fbfee830b97edc3c5e3d1ea
font_01_sfnt_off00016b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B6B 11212 bytes
SHA-256: 7a4637da4e689326177ec5e77515f25311b34bf12bae74d62d83236db782cf31

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