Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b277e1b391b4d3c…

MALICIOUS

PDF

87.7 KB Created: 2021-03-20 12:47:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 56ccf0e07915ec04274fb3a6eab045e2 SHA-1: 6090a1a8a51f684b9272ba964a763ac0992d1d99 SHA-256: 3b277e1b391b4d3cdfb8934f5330e32811c38d6de1e25adb1c41b29fdb44588a
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-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://jumiwimov.ru/strik?utm_term=argumentative+essay+conclusion+format PDF link annotation
    • http://optarfes.com/12927188662b67l9.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/printable_calendar_march_2020.pdfIn PDF document text
    • http://copalofa.site/blouse_cutting_tamil_ingh3jzb.pdfIn PDF document text
    • http://marketop.club/the_book_of_jasher_chapter_14wcxnq.pdfIn PDF document text
    • http://sudilufib.getenjoyment.net/26884470088.pdfIn PDF document text
    • http://safetymirrors.xyz/ejemplo_de_ecuaciones_de_primer_grado_con_una_incgnitalb8jb.pdfIn PDF document text
    • http://yarrebitteh.online/polazebenotazaduppktiq.pdfIn PDF document text
    • http://danivufulof.iblogger.org/rumotojajudijevawozegav.pdfIn PDF document text
    • http://copyright-notice-ig.com/671715605967mxpf.pdfIn PDF document text
    • http://umdtheatre.ru/pudoxe53s9c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_5f0dd40339a74293a9aa0c75a0d48ba0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lofese/63651885072.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/kavukebas.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/futekosetigulovapile.pdfIn PDF document text
    • http://gujimosodaza.myartsonline.com/wenabufesesubikeno.pdfIn PDF document text
    • http://lekozuni.epizy.com/ammonium_sulfate_precipitation.pdfIn PDF document text
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_930705f4d3174f5f877b3752a152cf9e.pdf?index=trueIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_430d491012db4d03b8558bf29dfc913c.pdf?index=trueIn 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_off00011909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11909 5352 bytes
SHA-256: d2ba6eb75fb85c66d724359c45015a90d532865114fb0f649098158c8334a236
font_01_sfnt_off00012b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3C 11272 bytes
SHA-256: 255b75c9e90921fc5340a96e73ef41a2c4fa9705f74e59365de0320c3c97e0cc

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