Malicious PDF — malware analysis report

Static analysis result for SHA-256 30bfd240052c4b04…

MALICIOUS

PDF

79.1 KB Created: 2021-09-20 20:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8807f05e4ff49598f4a8695b6175eb59 SHA-1: 2c3e06759d4de528573bc70e5d66425fcee54124 SHA-256: 30bfd240052c4b045def1c35fceb35372f6a27abcdfdca77fefa9d36dde33d56
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are part of a link farm. ClamAV and ML classifiers flagged this as malicious, specifically as a phishing trojan. The embedded JavaScript likely facilitates redirection to these malicious sites, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=how+to+insta+video+download PDF link annotation
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32635813479.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/fires.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/8105157387.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/julujagonivawevodonux.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/lololoxonu.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614670e053454---januxax.pdfIn PDF document text
    • http://jsdarvin.com/files/69402222505.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/zelererosumib.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/38590241478.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/98760787909.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/89796718797.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/gagovixufezoji.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/linaziruvaxamavegemolelo.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-8/20210908100013580442.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/donaxixogujivavipojo.pdfIn PDF document text
    • https://sanagustin.cl/files/13242073469.pdfIn PDF document text
    • http://skomi.ru/img/files/file/torenisur.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/rijomesad.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/94539359884.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/56637742841.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/56277398424.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_off0000d0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DF 10284 bytes
SHA-256: 3f2ad0fe5f73687ce391231c8a95cfaa9de7a886f8d611de6f3f9baadb00688c
font_01_sfnt_off0000e82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001003f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003F 18000 bytes
SHA-256: 1c4172f5123a322a884a084094f11f2389e48b23b90a5fc25568aa6bd653dbc1

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