Malicious PDF — malware analysis report

Static analysis result for SHA-256 691f7e948104cdcf…

MALICIOUS

PDF

74.7 KB Created: 2021-02-05 19:55:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 15874028e30a7af62445f97b36f254d4 SHA-1: 4b9ace6fa86545272f4bf926e4405ec48ddfc5af SHA-256: 691f7e948104cdcf2a6df97ffc0c904ddd37643444c1c4de3d90294b0dff15ca
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The primary malicious URL, https://crophysi.ru/wb?keyword=social%20networking%20sites%20pdf, is flagged as a known malicious redirector. This suggests the document's purpose is to redirect users to malicious sites, likely for phishing or malware distribution, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wb?keyword=social%20networking%20sites%20pdf In PDF document text
    • https://feposejixadolo.weebly.com/uploads/1/3/4/7/134744373/raxidumukuzimafum.pdfIn PDF document text
    • https://suluxeposinugu.weebly.com/uploads/1/3/4/6/134634013/9509f53.pdfIn PDF document text
    • https://nogabujo.weebly.com/uploads/1/3/2/6/132681452/todunaf.pdfIn PDF document text
    • http://domifonupesif.iblogger.org/manideniwozidurike.pdfIn PDF document text
    • https://cdn.sqhk.co/wujugojuse/DK9hibX/72_mobile_strike_force.pdfIn PDF document text
    • http://dijemakipesozox.iblogger.org/22680046381.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/rN89igF/asian_fairy_bluebird_daylily.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xonezerimagu.rf.gd/frozen_jr_let_it_go_sheet_music.pdfIn PDF document text
    • http://vedezaduxi.epizy.com/geroditapenet.pdfIn PDF document text
    • http://wutivufugisev.epizy.com/firewall_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/informacion_sobre_castillos_medievales_para_nios.pdfIn PDF document text
    • http://xilibosukotijob.epizy.com/60054388134.pdfIn PDF document text
    • http://tuxijug.rf.gd/87201796504.pdfIn PDF document text
    • http://vudunebavibag.epizy.com/manualidades_con_canicas_de_cristal.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/cartilage_anatomy.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/jexopadodobov.pdfIn PDF document text
    • http://vexidolovosope.rf.gd/jadamorigogepowelexitiw.pdfIn PDF document text
    • http://wupaxine.epizy.com/reference_letter_template_for_teacher_position.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_off0000e7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FF 5580 bytes
SHA-256: 66c3c4af83ea1f2cf9c69743e80c39a6909760bd0bd02f3203a2175df5177adc
font_01_sfnt_off0000fb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB20 10192 bytes
SHA-256: 570d586aeec0b7c03d763bb52d9974ad6468e2583e7aae873eaabd2307eed846

Open this report in the interactive analyzer, or submit your own file for analysis.