Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9e1ba36155dc11…

MALICIOUS

PDF

84.9 KB Created: 2021-03-22 19:08:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4f37216c9b02a8c047dd392ae1dc3337 SHA-1: 53c3d483a7ecbc7c4f7eea2889674efc7fa69cdd SHA-256: da9e1ba36155dc11a4d3139af41894e1568fa5921280744179ad3cfcb74448c9
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 0.9990

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/wix?keyword=minecraft+enchantments+id+bedrock PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454306/normal_5fd77a71e14d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412387/normal_601129dfea2e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366351/normal_60324c6c21104.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464865/normal_6058add692bae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414500/normal_5fff41ea8514c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498645/normal_5fe077ea61793.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457839/normal_600ef9a27d5bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369777/normal_5fc869fdcb308.pdfIn PDF document text
    • http://babilexogir.22web.org/pci_syllabus_b._pharmacy_2020_19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482403/normal_5fcabca451d90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487192/normal_6033e115c16f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486745/normal_602194f39f988.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417990/normal_6039fab1916df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369933/normal_5ffd0e11ed87f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377407/normal_5fca7e61191f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366327/normal_6042f6ad2644d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_35726e42ddd941638ac50007456adc99.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f387c788-e78f-4713-a6e3-d2a645409320/wikuxugogafidabosuku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfc5299e-be90-459c-adf0-b8a15c5b8238/bank_accountant_job_in_karachi.pdfIn PDF document text
    • http://negifunowulag.rf.gd/83201830548.pdfIn PDF document text
    • http://mujusitajal.rf.gd/megixebejas.pdfIn PDF document text
    • https://105d84dd-9b22-4355-af37-21382b2db671.filesusr.com/ugd/f4243a_300d6e8c9465456cb9ab4dac5e8122e0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/74fb2ad4-432b-4a6c-a40e-49837b97208f/beethoven_sonata_no_5_op_10_no_1_sheet_music.pdfIn PDF document text
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_69d84f22539240dab08f355db3fe8835.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFF 5228 bytes
SHA-256: 9b7e0fbb5f93c437f6b0d4ce5d986c1776cdef628306cf625aff26d8062cae62
font_01_sfnt_off00011189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11189 11100 bytes
SHA-256: cafb7f037334345db8164766e81b2c27b66968a446126fd9430ef5dfd11ae38a
font_02_sfnt_off0001376a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376A 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176