Malicious PDF — malware analysis report

Static analysis result for SHA-256 859de4d687915310…

MALICIOUS

PDF

82.6 KB Created: 2021-09-22 16:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5c7556ee9404239a7833c137dfdc82fc SHA-1: f15233ba3b8d6d6ea3b5c3f4994cecf1e18cac1f SHA-256: 859de4d687915310fb5764269f4949574aa9f760b66ec5ea9a6b4d9214cd9146
142 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to PDF files hosted on various domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via a deceptive download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://jinsonmetal.com/Upload/file/zesejovim.pdf In PDF document text
    • http://geometrarontani.it/userfiles/files/tidumumejizok.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/35167737848.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/44614282835.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/temotuge.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/nuzutajor.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/78109550764.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/maxibu.pdfIn PDF document text
    • http://www.siposferenc.hu/html/58605635247.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/48379259523.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/mezixafarolabesakita.pdfIn PDF document text
    • https://argumentua.com/i/file/76412042386.pdfIn PDF document text
    • https://rajakedua.com/contents/files/nizuzuduwarikuneli.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/dijusotir.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/terit.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/47097799944.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/74578282394.pdfIn PDF document text
    • http://hasyo.net/files/file/fafibudiza.pdfIn PDF document text
    • http://araratmebel.ru/img/file/kibakarupixeganuzijuwi.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/94272890807.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/49009942272.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/62223497243.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/gojaboxodug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=chal+mera+putra+filmPDF 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_off0000de3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF650 18284 bytes
SHA-256: 2eb206be43ae63e315a556c23c4a55c13e764b811c3e2e20aaed1a002dafa299
font_02_sfnt_off00012595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12595 10364 bytes
SHA-256: b690be67bd5a63100a861fb601d1a51e7bbbd36353f859b6bb3a1d9403fea222