Malicious PDF — malware analysis report

Static analysis result for SHA-256 73232b9a7bf8911e…

MALICIOUS

PDF

80.3 KB Created: 2021-06-13 07:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 70427ff3d9396b672de20ce9f8cf3d58 SHA-1: ed6e2c8158abb0b6504a3949f2894190058e0f8b SHA-256: 73232b9a7bf8911e361fc31725181fc8e50eaac1c2660dd92202e724c34f8306
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it functions as a link farm, potentially for phishing or malware distribution. The embedded URL 'https://infrive.ru/pbw?utm_term=corazon+de+ni%25C3%25B1o+piano+sheet' is a primary indicator of this activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/pbw?utm_term=corazon+de+ni%25C3%25B1o+piano+sheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405904/normal_5fd87641ad02c.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4451736/normal_60b4c5062ead6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470211/normal_602ea9c116b41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478685/normal_5fda2ef7d6f1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489586/normal_6000e6cc2a6fd.pdfIn PDF document text
    • https://panikelixiguju.weebly.com/uploads/1/3/4/4/134478359/2708274.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413573/normal_5fdd96f88fe12.pdfIn PDF document text
    • https://levivododusot.weebly.com/uploads/1/3/4/3/134307397/nawamunaxuse-bajele-zojudedaxugazi-lofune.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369308/normal_5fe1b396c0e66.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xedidovetaw.pbworks.com/f/hyster_forklift_fault_code_168-4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff689e03-ebd4-4fd6-a48b-d590193b3d58/68289507302.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37b735b7-7a17-49ab-94ec-813e5d7bd833/jajasirovozumagox.pdfIn PDF document text
    • http://tereburokofe.pbworks.com/w/file/fetch/145173171/dozemekosuwujomefev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18664280-087c-438e-ad47-afe0bcad3f8d/pinep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb422bde-ef18-464e-b5b9-920d2b049b3f/dagegovuwofutivivaje.pdfIn PDF document text
    • http://zoririlebo.pbworks.com/f/nolebipoponig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dc90423-ea68-41ec-a40e-d2bb7dff239d/jegatinu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a2d78ef-0494-436b-bd2d-b80b327346ca/certificate_for_aadhaar_enrolment_update_form_version_2.0.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8a44909-c6eb-46eb-9091-640fdba0f0c7/samsung_bypass_google_verify_apk_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3cf5f98-c469-4d24-b49b-78dd6a359ad8/the_republic_by_plato_book_10.pdfIn PDF document text
    • http://mujefapufefi.pbworks.com/w/file/fetch/144808743/15048947047.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3F 2996 bytes
SHA-256: cc818ed9a62ae2b794c5d06e5d452725d30f412bee07a7203a6ca420bb733cf6
font_01_sfnt_off0000f902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF902 5180 bytes
SHA-256: 0face78fc31c5588ccdcdfcdb1f2a46c5c8e6da0d5a08c57d5ec71816c2ce505
font_02_sfnt_off00010a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A56 12396 bytes
SHA-256: d9a7ef8b2f0ee14b0fe7d5bfa4453b52bdfedd88477b4b54b1f0277090ee72da