Malicious PDF — malware analysis report

Static analysis result for SHA-256 3105cec873f8824c…

MALICIOUS

PDF

106.2 KB Created: 2021-03-29 16:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f7faaabb98a0667e08e0ae0a6b94ea55 SHA-1: b0807115aa5cdb2eec31c0319830b85216316edd SHA-256: 3105cec873f8824c4209c0d9473d1f2953b78812cea6388b30eb5630e67e0e3e
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 0.9998

Heuristics 6

  • 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 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://seumenha.ru/123?utm_term=tratado+de+basilea+ii+pdf PDF link annotation
    • http://zunololanuxigu.sportsontheweb.net/wilajogupo.pdfIn PDF document text
    • https://gavuzidawosowek.weebly.com/uploads/1/3/1/4/131413418/dupit-telanav-kexozak-doxatekelumixeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391907/normal_605d874e51b05.pdfIn PDF document text
    • http://moxilekulina.getenjoyment.net/cavinton_forte_ulotka.pdfIn PDF document text
    • https://gotowetup.weebly.com/uploads/1/3/5/9/135957180/lemijojobodowi-tuwubigijukete.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414687/normal_5fecbb8d941ca.pdfIn PDF document text
    • http://makudejolas.iblogger.org/samsung_ht-j4500_not_working.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413978/normal_604de458ddc64.pdfIn PDF document text
    • http://rogepexegugujer.22web.org/87816704768.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://momedeturus.epizy.com/batixobizobup.pdfIn PDF document text
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_60ec44d6cd064e9bb0518a63fd2f64df.pdf?index=trueIn PDF document text
    • http://lododaz.rf.gd/melhores_poemas_cecilia_meireles.pdfIn PDF document text
    • https://ede36962-9452-4451-b182-fa4236ba9bc6.filesusr.com/ugd/83b1b3_84b6a17af1154e979147ff766db2761b.pdf?index=trueIn PDF document text
    • https://0b21792c-a699-4cf4-8833-5910c6ad58af.filesusr.com/ugd/b0b521_47706eb4d51d4b8880da7038fdcf45bd.pdf?index=trueIn PDF document text
    • https://f499a9ea-5579-4d3c-a180-ba191067f9b7.filesusr.com/ugd/34ec99_57cae0a6afa4479bbd8942a2854a38ae.pdf?index=trueIn PDF document text
    • http://muzobun.rf.gd/40142111505.pdfIn PDF document text
    • http://luwemazezabubat.rf.gd/bubble_shooting_games_for_pc_free.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_off00015395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15395 4804 bytes
SHA-256: 2667b523a55707c7a364216af3f203e2f917897550d35dda8b7f2d4759483c7d
font_01_sfnt_off000163ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163EE 13508 bytes
SHA-256: b7923bdd91afc272970dee4478f5a8963ae2dde559d2d5c7503f81f716e01403
font_02_sfnt_off00018c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C0B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f