Malicious PDF — malware analysis report

Static analysis result for SHA-256 176a4f5e1badfd1a…

MALICIOUS

PDF

71.2 KB Created: 2021-05-16 11:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e0715acc31b5ceb084febd3fb9718e18 SHA-1: 701067e4f1b31152746f741ad52def0547e3aa7a SHA-256: 176a4f5e1badfd1a7b360b0825f75f6662ccadab97327630ac173d5d9db119a4
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 0.9998

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
  • 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://dafemum.ru/strik?utm_term=polaris+3900+debris+bag PDF link annotation
    • http://rajajime.mypressonline.com/alfie_kohn_beyond_discipline.pdfIn PDF document text
    • http://giwepaz.iblogger.org/wiwarigajozetazakemiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388163/normal_6011d503f2405.pdfIn PDF document text
    • http://rerixen.scienceontheweb.net/branded_content_marketing.pdfIn PDF document text
    • http://pobunav.sportsontheweb.net/siveger.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406229/normal_5fcb14fb75804.pdfIn PDF document text
    • http://xabudumame.mypressonline.com/ap_sachivalayam_anm_merit_list_2020.pdfIn PDF document text
    • http://manaluw.iblogger.org/python_programing_book.pdfIn PDF document text
    • http://tanolugulutewu.medianewsonline.com/clasificacion_de_centrales_electricas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3aeed8c-13bc-4b9c-b979-3a2c7821e97f/what_company_makes_nordyne_furnaces.pdfIn PDF document text
    • http://jokodeg.rf.gd/japibe.pdfIn PDF document text
    • http://ronirito.rf.gd/17740066185.pdfIn PDF document text
    • http://kokivifox.epizy.com/wobulixegujevanod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddcbc853-d2d9-47b4-8129-9b1036c6bff9/lasirelapewifesukut.pdfIn PDF document text
    • http://wobemiko.epizy.com/adobe_sign_multiple_documents.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/842c1aa3-1a2f-447e-824c-f9fe619776cb/27044678448.pdfIn PDF document text
    • http://xifogufog.epizy.com/arpeggios_classical_guitar.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_off0000d742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD742 5596 bytes
SHA-256: fa95926f434f032e61828579223b1a545944f3ac18578a8187d4a54a573580aa
font_01_sfnt_off0000ea3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3F 11112 bytes
SHA-256: a8871669eebdfea03e1adbcc8d6a989ca66093dae119ba5003d903a42739bf3a