Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bcf03c4ca06c8f4…

MALICIOUS

PDF

80.9 KB Created: 2021-09-14 06:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: d4e8b1c1dac5f87d7197c894219f25f3 SHA-1: a050fbdd287816924351d6c48ba74e44fc1d29fc SHA-256: 6bcf03c4ca06c8f4d96f75c510ec0d54b1b73e38f123419461896ba646b7789e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=vertex+of+a+quadratic+function+calculator PDF link annotation
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/weluputiwemizevuvag.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/dalasofadufetexemevapuso.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/8987164949.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/47091649149.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/temudofazawa.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/jikimuw.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/98065503302.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/puzetajewovozi.pdfIn PDF document text
    • http://mitrasuksesku.com/userfiles/file/34081470956.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/dareru.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/ponedowufux.pdfIn PDF document text
    • https://securitydm.com/slicice/file/17266892823.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/41568289616.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/31500158483.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-2/20210902231156741164.pdfIn PDF document text
    • http://sdds.be/userfiles/file/33578278727.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/51526538178.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/razilusolibugedifilovo.pdfIn PDF document text
    • http://agilesolutions.in/uploads/xebozumag.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/ganafasolivotofesu.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/rasomak.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109121246244345.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/padobatazasizupo.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DA 17160 bytes
SHA-256: 27c424e346ac9ba92326e2f3a52db829dca01e798eca872488ad7f3a73a7ed62
font_02_sfnt_off00011d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D61 10616 bytes
SHA-256: 40e11639266cab9e04d7e26de44421e3fa68be9bd31328d37301569eeef5002f

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