Malicious PDF — malware analysis report

Static analysis result for SHA-256 59ddef99eb0c2ad0…

MALICIOUS

PDF

76.5 KB Created: 2021-04-04 08:39:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5b8a0cf0b722379a2594511bb2e19d82 SHA-1: 169dde8e3ac4418874577565f9df988905286561 SHA-256: 59ddef99eb0c2ad053211d381acfb13d5c26cf74f55847ac15e7a06ebc21296e
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 0.9997

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://xezojetit.ru/123?utm_term=aradhana+movie+audio+songs+free PDF link annotation
    • https://cdn.sqhk.co/parapirer/5PKyjeM/farming_simulator_14_online_free.pdfIn PDF document text
    • http://ziwusis.getenjoyment.net/pdf_of_biochemistry_by_satyanarayana.pdfIn PDF document text
    • http://tejowigasinafu.getenjoyment.net/42565402447.pdfIn PDF document text
    • https://cdn.sqhk.co/fipufose/sjhyjar/lurujagenasubuzerep.pdfIn PDF document text
    • http://zonuvak.medianewsonline.com/answer_sheet_template_1-30.pdfIn PDF document text
    • http://gupirigugorixuf.sportsontheweb.net/69692833797.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/rimejiguvif/pazakozami.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/rigapefowefi.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/crazy_madilyn_bailey_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24fc2aac-d00d-4b39-9e47-8d8b4678d361/tumelaxupigovavapasi.pdfIn PDF document text
    • https://d1e718d6-368d-4e36-871d-50e039471320.filesusr.com/ugd/89b1bc_361298c9e56346e5a838cc5b6e6ac4bb.pdf?index=trueIn PDF document text
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_043f088d713a425b8f7b44a7b0d68c39.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a4b2169-0682-4307-b7ef-8380525a29c0/tolagu.pdfIn PDF document text
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_62941ae4c908454394763910c32ee2a0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a0a52cd-fb1c-429e-91a5-b6814639ea2f/waladofomefimezixulufuwij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e64139d-0129-4249-b748-c4acba32a4ee/which_type_of_companies_listed_in_stock_exchange.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aeaa9ff-0d50-4f86-af01-f3d0a9286c5c/can_you_replace_the_battery_in_a_citizen_eco_drive.pdfIn PDF document text
    • http://mifojizu.myartsonline.com/66049207212.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bb6c347-aa95-431b-b68d-d52758026655/49449192852.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5da140e4-1afb-49c0-993d-bce6f52778a8/dell_e207wfp_monitor_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c98dc0e-3ce5-42fa-b466-20f1406810d5/angularjs_book_download.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_off0000ec66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC66 5336 bytes
SHA-256: 497d4325bc956f8e7cdb6bb83e10bf4f0399290d1d4e104ec280330ddac9054b
font_01_sfnt_off0000fe6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6C 11352 bytes
SHA-256: b064103ae2d48120cd19c0add3b66779b0fa5c46cb4b7d4bee1a0b512bdb6685