Malicious PDF — malware analysis report

Static analysis result for SHA-256 586518bfc9dea64c…

MALICIOUS

PDF

82.5 KB Created: 2021-04-01 18:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 460a8ee2aee76298605e9eeb4d83e1cb SHA-1: 54c80d9e5a95c134b02ee421596709fda32fb0df SHA-256: 586518bfc9dea64c36c00439b8152970e8d09a249e141724dc6abc55e87fe282
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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+use+combination+oven+microwave PDF link annotation
    • https://cdn.sqhk.co/miropefaneka/tdjgc2X/66892229312.pdfIn PDF document text
    • http://runatem.66ghz.com/google_sheets_if_statement_contains.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/flUqiaJ/94804351591.pdfIn PDF document text
    • http://solokovalafewo.iblogger.org/janivabazovogavirim.pdfIn PDF document text
    • https://cdn.sqhk.co/tejusukaxajo/1igKKhj/85946505967.pdfIn PDF document text
    • http://bepelus.iblogger.org/systems_of_linear_equations_and_inequalities_worksheet_answers.pdfIn PDF document text
    • http://jevuzedozuk.iblogger.org/rudiments_of_computer_science_download.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://uploads.strikinglycdn.com/files/97b9d270-39d5-4fae-8123-2ecc5290dd5c/29578259967.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deae31eb-db1b-4934-a552-8e2e26f63d44/madoriferorinijawamekeja.pdfIn PDF document text
    • http://gazezubutajon.rf.gd/iit_jam_mathematics_syllabus_2020.pdfIn PDF document text
    • http://kutadomirezo.rf.gd/49129998031.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/191ddec6-f28b-4e16-915e-137350733dcf/93543143856.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be28ae2a-6444-4775-892f-a4cd22355a14/56269513977.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db0a0628-8953-497c-8362-549d06b6b2c0/41268691721.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dd22e0d-34f2-4bb0-a6de-cf9313416b12/34549490282.pdfIn PDF document text
    • http://fejozimi.epizy.com/falukav.pdfIn PDF document text
    • http://zuvineduwofuxo.epizy.com/cahier_de_vacances_ce1_ce2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b73f0888-9b01-432f-a490-e0dc224ee5ed/how_hard_is_it_to_learn_stochastic_calculus.pdfIn PDF document text
    • http://mujusitajal.rf.gd/kolimejopitobupisadov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caf6ba8e-3231-4c66-9255-fc6c14132665/what_is_the_social_constructionist_mission.pdfIn PDF document text
    • http://gemesiwexalizel.epizy.com/mefabobaxilekakopidebor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71cb3769-0670-4bcc-8ee1-4cad0d7ee89a/71709418444.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c585b804-c7de-492a-a796-fcb68754724f/lg_side_by_side_refrigerator_user_manual.pdfIn PDF document text
    • http://kadegezopofog.rf.gd/completing_the_square_worksheet_answers.pdfIn PDF document text
    • http://gajedimigifupet.epizy.com/ridetonobawewefosev.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_off0000f7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B6 5048 bytes
SHA-256: 909c647c9c167bde98dc27776a604eb3012ce0a7bb3921f67371f9318a52d2e6
font_01_sfnt_off000108d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D6 11372 bytes
SHA-256: b72cc3bd5bedb4277e2055a0292de75220d362baab98d6df033cc4714110b984
font_02_sfnt_off00012f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F37 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34