Malicious PDF — malware analysis report

Static analysis result for SHA-256 213ebfbe2b71e55b…

MALICIOUS

PDF

125.2 KB Created: 2021-05-15 20:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d60ba77d6f29b9b3ad60ab90fb95f67d SHA-1: b4c3c1f1a66d06453079f7acd407e517e2067e9c SHA-256: 213ebfbe2b71e55b21e0ea4a3054d8a629cd4f65d2e7f753545accd5ec4e6c36
186 Risk Score

Malware Insights

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

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 0.9986

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/strik?utm_term=how+to+read+a+business+electric+meter PDF link annotation
    • http://vimoroketoburiv.22web.org/problem_solving_techniques_in_computer_programming.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470960/normal_5fca5fbd032d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401555/normal_606dde134de4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455396/normal_605377c1e7fd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490266/normal_6066b6262e264.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452850/normal_6056a8d62c907.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_f3389afda8f243a2abf7f36698a93b4c.pdf?index=trueIn PDF document text
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_ce10f73c6ca3450bb5e43247b9b0c44b.pdf?index=trueIn PDF document text
    • https://2c8134a4-d865-4da1-8961-c755d7242105.filesusr.com/ugd/6dcf04_d187a5dda424423f9e39d3653cd53407.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a498f7d3-944d-4807-aa4c-3005747365ac/cuanto_vale_un_metro_cubico_en_litros.pdfIn PDF document text
    • https://c09438b0-f1cf-4ade-afa2-d322e048c450.filesusr.com/ugd/313cc6_4228078623d546caa86ef45265ff06ab.pdf?index=trueIn PDF document text
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_7b17782e6988400daf04a64cc3c838fb.pdf?index=trueIn PDF document text
    • http://firotiz.epizy.com/tujeweri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6109fdcc-c38f-48c7-aed9-e40bff194e73/turn_photo_into_avatar_free.pdfIn PDF document text
    • http://xegunapajom.epizy.com/cleaning_service_contract_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e813990-4638-4de2-a648-6c810f52e4d3/32033977963.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/theseuss_defeat_of_the_minotaur_is_an_example_of_which_concept.pdfIn PDF document text
    • https://5b949be5-44ef-49af-96c7-0ebaa8fe632e.filesusr.com/ugd/3402b1_dc829ae5a8764d3fad017875a53a5610.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bomupi/suwevonu.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/how_to_repair_pallet_truck.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e76cd511-b454-4f4e-9f68-4e9fb16bc822/air_transportation_a_management_perspective_wells.pdfIn PDF document text
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_419a70cc022c4f63b61bfb1849306e7f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuses/celemony_melodyne_3_free.pdfIn PDF document text
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_79d4353a472e4d6c999367f89df80642.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_off000195c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195C5 5276 bytes
SHA-256: d26594db66b6416e88e6868c62c58c1a48986ef933b6ec599206947418fa0da2
font_01_sfnt_off0001a7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7AC 12616 bytes
SHA-256: b3ed738b43981e13d6ad337c1f5f474b4896d94c79c704f5657aaedc49d2b373
font_02_sfnt_off0001d1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D1A9 16060 bytes
SHA-256: ae97ebdbf5cb6679ee3ae7f6f8963da9ec2437ada1f672a33085bc8cbe806833