Malicious PDF — malware analysis report

Static analysis result for SHA-256 9926e17f4fc0df06…

MALICIOUS

PDF

131.0 KB Created: 2021-04-08 09:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3a40111d790a2802bb7a7d98c1ad5ac4 SHA-1: 9c30b85b20be22009ffeb972e969fd562df3b3d5 SHA-256: 9926e17f4fc0df0621e359a8eceb22e1d796b0a08e87747888859b784b0534cb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to benign-looking documents, suggesting a link farm or SEO spam operation. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs are likely used to redirect users to malicious sites or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://kuzutuzo.ru/123?utm_term=bhakti+song+dj+mein PDF link annotation
    • https://cdn.sqhk.co/mopewedote/r1Ggf9K/97321038609.pdfIn PDF document text
    • https://lumejukotexute.weebly.com/uploads/1/3/1/1/131163930/lomonobotijuj-mepegakevu-sumukofu-ziletogo.pdfIn PDF document text
    • https://cdn.sqhk.co/fojevimexu/mgeligy/soxegekakiv.pdfIn PDF document text
    • https://cdn.sqhk.co/kisasizaro/niengew/white_dog_puppy_wallpaper.pdfIn PDF document text
    • https://migawonakizize.weebly.com/uploads/1/3/1/6/131637147/vanigotewukemov.pdfIn PDF document text
    • https://zokamufonokori.weebly.com/uploads/1/3/1/1/131164159/momarapisa-sosire-sitivaf.pdfIn PDF document text
    • https://goduvozimaku.weebly.com/uploads/1/3/1/3/131380582/5267a76be87.pdfIn PDF document text
    • https://sarejazaxixosib.weebly.com/uploads/1/3/4/6/134633098/5508881.pdfIn PDF document text
    • https://cdn.sqhk.co/zakolemafemo/d3RUieQ/noditafugitowovipisoronu.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/qjigghd/sliced_bread_market.pdfIn PDF document text
    • https://cdn.sqhk.co/moxibusas/hiHiihs/gudoxilibuxisef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sisaxu/homeschool_schedule_template_2nd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/36653456680.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/5e_wizard_multiclass_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/conflict_management_competency_interview_questions.pdfIn PDF document text
    • http://jokubamobivavum.onlinewebshop.net/73198426823.pdfIn PDF document text
    • http://sulorowanutabu.atwebpages.com/bestiario_descargar.pdfIn PDF document text
    • http://duwemanuwixam.atwebpages.com/spanish_stories_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/gromacs_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/renewal_form_for_british_passport_in_australia.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_off0001c9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C9F9 5300 bytes
SHA-256: 02e13df52e36fdc1cfc48105ea2b2e88a2e0ab45bde63047c887e9625155a662
font_01_sfnt_off0001dbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DBE1 10612 bytes
SHA-256: fb73910d11d629ab3ad50f65c4182c5101096e609bb87837f8d4f1fed87e0d65

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