Malicious PDF — malware analysis report

Static analysis result for SHA-256 b74dc19a764d6608…

MALICIOUS

PDF

84.3 KB Created: 2021-05-16 03:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fc629ba431abbdbcd1bd4299e990c196 SHA-1: 3e7c75e20aa5ba116d0984f1077fca3ba89cb0a2 SHA-256: b74dc19a764d6608f68da8841d551047d68295034c34fad25ebde4e7b0562541
186 Risk Score

Malware Insights

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

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 6

  • 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 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://nipisod.ru/strik?utm_term=brandsmart+usa+black+friday+deals PDF link annotation
    • https://turabevov.weebly.com/uploads/1/3/0/9/130968962/4696438.pdfIn PDF document text
    • http://tohld.in/mejulunuvovizidevakukari5chv.pdfIn PDF document text
    • https://dakubazelup.weebly.com/uploads/1/3/1/4/131454222/5252477.pdfIn PDF document text
    • http://bifozitixexidad.mygamesonline.org/accidents_at_workplace.pdfIn PDF document text
    • https://xizuxikeg.weebly.com/uploads/1/3/0/7/130740292/buwilenexu.pdfIn PDF document text
    • http://kernig.online/pure_cash_free_cash_rewards_apkg26ci.pdfIn PDF document text
    • https://demavagof.weebly.com/uploads/1/3/4/0/134017100/dujajekomilisuw_pejexasapozub.pdfIn PDF document text
    • http://dedigevobunobe.medianewsonline.com/arcgis_10._3_manual.pdfIn PDF document text
    • https://paguzijap.weebly.com/uploads/1/3/1/4/131453408/xijanoziroxus-wemamon-tagosojadukar.pdfIn PDF document text
    • https://xivapumi.weebly.com/uploads/1/3/1/6/131606059/paxegi.pdfIn PDF document text
    • http://youla-24.cc/food_safety_manager_certification_indianaannf2.pdfIn PDF document text
    • https://vosutiwurog.weebly.com/uploads/1/3/5/4/135400890/xazazifisif.pdfIn PDF document text
    • https://ranutejojem.weebly.com/uploads/1/3/5/3/135314135/niruv.pdfIn PDF document text
    • https://viwekaxirudadax.weebly.com/uploads/1/3/4/7/134700275/8580912.pdfIn PDF document text
    • https://xexonuza.weebly.com/uploads/1/3/4/3/134305788/9770df.pdfIn PDF document text
    • http://ruwufuwetoj.mygamesonline.org/fetosafenapapinirawunu.pdfIn PDF document text
    • https://forabuluzasojar.weebly.com/uploads/1/3/5/3/135303956/63267366f5e.pdfIn PDF document text
    • http://kevufeduwatawos.mypressonline.com/jerugugal.pdfIn PDF document text
    • http://tiwimifozukimu.medianewsonline.com/processing_of_seismic_reflection_data_using_matlab.pdfIn PDF document text
    • https://lavaseke.weebly.com/uploads/1/3/4/3/134383013/teguliwawiforamuvufe.pdfIn PDF document text
    • http://jidudilubad.mygamesonline.org/77304761015.pdfIn PDF document text
    • https://sijokazodile.weebly.com/uploads/1/3/1/4/131454207/f3b1ddc34a.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
    • http://gidubabe.myartsonline.com/suzuvusugusosiki.pdfIn PDF document text
    • http://tebaputazaxuva.myartsonline.com/importance_of_baseline_survey.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_off0000fb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6D 5292 bytes
SHA-256: 6909ed18f863ec998729644501b76456f1b747d432d35f940cd8b0780be08df6
font_01_sfnt_off00010d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D57 11704 bytes
SHA-256: 7713b0f2aba57c08bb9a229574b8eba3cac619bc73fe747094dd2e91cf4e442b
font_02_sfnt_off00013540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13540 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3