Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37e2f491658196e…

MALICIOUS

PDF

73.2 KB Created: 2021-03-13 16:44:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5e0440b974960a4d72c763863c8339c0 SHA-1: 31004e35fbf0fec2dadf539c5b7b94b3831f1d31 SHA-256: d37e2f491658196e97962a3e81aa42dc06eebb470380c4229c96a3c84ba17ba0
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 0.9997

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://vilenefex.ru/strik?utm_term=how+many+years+to+study+dentistry+in+uk PDF link annotation
    • https://cdn.sqhk.co/dodamewope/bogcsC3/23155032316.pdfIn PDF document text
    • http://nejupike.mygamesonline.org/what_number_is_newsmax_on_cox.pdfIn PDF document text
    • http://poputitekokukad.iblogger.org/54920171631.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/jpG6gfz/pupaputezu.pdfIn PDF document text
    • http://baxijemapuzoxu.22web.org/free_gaming_video_intro_templates.pdfIn PDF document text
    • http://vumajufeboxidik.mywebcommunity.org/cuisinart_air_fryer_toaster_oven_accessories.pdfIn PDF document text
    • http://laribij.scienceontheweb.net/defending_jacob_novel_by_william_landay_ending.pdfIn PDF document text
    • http://kukikifo.iblogger.org/wow_classic_warlock_guide_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471099/normal_6007fc4090543.pdfIn PDF document text
    • http://fegalaro.iblogger.org/29845271539.pdfIn PDF document text
    • https://cdn.sqhk.co/mewobonovagi/MhjMupI/naralonidobi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369512/normal_5fd72ebed3d73.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tinatuvarisofat.epizy.com/51227230516.pdfIn PDF document text
    • http://wulisafule.epizy.com/a_levels_chemistry.pdfIn PDF document text
    • http://subedawulowuwo.epizy.com/33346725422.pdfIn PDF document text
    • http://jiporiri.rf.gd/how_many_polar_bears_are_left_in_captivity.pdfIn PDF document text
    • http://kileduf.epizy.com/pemovowigupawadamobulumi.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_off0000e36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36A 5160 bytes
SHA-256: f08b1d3e746779b76f196cc9f35e94a59e75d06d7da80e78d3d1f733544ad37b
font_01_sfnt_off0000f4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EF 10276 bytes
SHA-256: c32dca517bf0498d8dc26cb5cdbf399683348b39629652b563bf8a3522c2fd8f