Malicious PDF — malware analysis report

Static analysis result for SHA-256 7631cd6c9f41f7f2…

MALICIOUS

PDF

73.2 KB Created: 2021-04-04 19:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 252dcf7e426ea99f364534f0e3271c24 SHA-1: b095be5a45f227d0736908c5e69277dc38cb4d55 SHA-256: 7631cd6c9f41f7f274ba38060f5a08dc7e17ab2bc6b4e68c65e7dfb7e2d09aab
166 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. It uses brand-impersonation credential phishing. 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 0.9996

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://midufefew.ru/wix?keyword=mitsubishi+montero+sport+parts+manual.
  • 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://midufefew.ru/wix?keyword=mitsubishi+montero+sport+parts+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488580/normal_600fbb8600e71.pdfIn PDF document text
    • http://dizurexemubegog.mygamesonline.org/b._d_singh_book.pdfIn PDF document text
    • https://cdn.sqhk.co/wesuwajil/ijjhhfv/liturulemoxabegabukegaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487197/normal_5fc9e046c46fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446170/normal_5ffe425edc8c5.pdfIn PDF document text
    • http://fiduvizowema.iblogger.org/42711045778.pdfIn PDF document text
    • https://cdn.sqhk.co/zajikeze/VNXgdzQ/microsoft_excel_spreadsheet_test.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a9f3490c-def6-45ea-9957-aefa341d54bd.filesusr.com/ugd/84b587_cbe400d04de24663ace3ad567802d46c.pdf?index=trueIn PDF document text
    • http://dimizisunope.epizy.com/ipmn_guidelines_2017_radiology.pdfIn PDF document text
    • http://gotuzarodeg.epizy.com/wulatodez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82381fd2-2b07-42fb-a911-b759d388116a/tavimulodefu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bdc5e3e-3ba1-405d-a708-06c7d0ac3cfb/69498391045.pdfIn PDF document text
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_4f98890e88d841b182cab0d8a3f5fef5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/260fab2f-e187-46a8-8d97-7e973a18cef4/49383921420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7afad83d-b10a-47c6-908c-9cd33f8a9f0e/hp_photosmart_5510_printer_troubleshooting.pdfIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_efa97f44f53c4a3098db74a8fd7bef3f.pdf?index=trueIn PDF document text
    • http://bolirazebaf.myartsonline.com/calendario_escolar_2020_mineduc.pdfIn PDF document text
    • http://nivufebolira.epizy.com/how_to_program_intermatic_light_switch.pdfIn PDF document text
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_92e445128055400ab1e652ae67589da1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/330c8207-b29d-4b45-8ee2-8e01bb4486b6/triumph_tiger_cub_manual.pdfIn PDF document text
    • http://lojizigakuxit.epizy.com/judezasozotubawote.pdfIn PDF document text
    • https://05282879-aed3-4f16-ac14-d534add4d4bd.filesusr.com/ugd/0f8b7c_4008dc1362bc467d88288591ba6cde7e.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9C 5204 bytes
SHA-256: a54dda6063c03fc140822b5aa9524e445fdec23930f647cd27df9e34d87159b8
font_01_sfnt_off0000f020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF020 11140 bytes
SHA-256: 71ee889ca0760a75d014f380813fe3d8ae7887f1387cef758a71c817dba53240