Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d08c95ecc5b0fc1…

MALICIOUS

PDF

80.2 KB Created: 2021-09-09 23:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: eec3f9fb62755aed3f7ac647554156fe SHA-1: 8046486e2d1627f41a6c20e3ca61ffdbea7908de SHA-256: 3d08c95ecc5b0fc1dc7480d87c3fd1a180258aee72e57b4f13e41961de51bf4b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest an attempt to obscure the true destination or distribute malware through a network of disposable domains. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 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://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/28201516413.pdf In PDF document text
    • http://p-jtech.com/userData/board/file/3752294709.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/36724568830.pdfIn PDF document text
    • https://estoniapools.com/contents/files/79722650688.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/rokivadez.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/kiborilukevinudinugeroze.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/20913659392.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/jupigupobi.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210902/0430589388.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/42583150951.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/84407555410.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/68537153583.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613864a27aceb---15187875375.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/vidamoxiworebujonuwanu.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/14118561851.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/xazolunalibixopaxosaroj.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/86513713633.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/juxatox.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/59624627983.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/16070750637.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/dabagadovadawuvepofadu.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/28330447853.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/25005976428.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/42286949051.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/zeletudogudozuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=inspirational+words+that+begin+with+dPDF link annotation
    • 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_off0000d553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD553 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6A 10848 bytes
SHA-256: ffdd872b22d4c9b57d8a03fc83da59e1f17a96a669ce5270ba8ff07c2f3aa0bf
font_02_sfnt_off000105fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FA 17732 bytes
SHA-256: 8393ac7e3c221a0d193a975b5e7ca7c5aaf3cdbaa5ced3f300aa7bb1804c4dcc