Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d2314dd867f528e…

MALICIOUS

PDF

73.6 KB Created: 2021-09-13 15:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6470b14d8157f649871f3583a820e335 SHA-1: d829360deb773b4b5ec07649cfd5fb4e4ab55af4 SHA-256: 4d2314dd867f528e5f27b867a215896c1a3dd4a16a8dd62df9e5a1a4b83a70c5
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 a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external links, contributing to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://greenld.com/userfiles/90561624355.pdf In PDF document text
    • http://praconsulgroup.ru/pict/file/zizamurob.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/vilawunixafabuzijuwi.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/volapomikesabuzoboluz.pdfIn PDF document text
    • http://wirheiraten.de/images/file/damibiwopujukafarejun.pdfIn PDF document text
    • http://8njl.com/userfiles/files/wogodapasibumidizumixa.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/72839985618.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xunosuxobepuwukawunovas.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bunoditorisuwaraw.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/73167831790.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/rixatit.pdfIn PDF document text
    • http://favourtec.com/attachment/file/kuzuzobevezulukebopix.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/50977158945.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/44782239390.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/ramivikuvobujizo.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/75114671649.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/lefuletenutu.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fff87e2dd8---xuritanubegiz.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/gisorujerumuzufududip.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/80777887347.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/58712040676.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/lapejesobenepowewuxufod.pdfIn PDF document text
    • https://teamcode.net/upload/files/linarararibigalikupoxomu.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/dobedaxoziwobujuki.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec7c9638ce---15158201222.pdfIn PDF document text
    • http://yongqingtech.com/d/files/2113233877.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=bharat+dak+trackingPDF 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_off0000b92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB92E 18548 bytes
SHA-256: 3619583b19abec439b3bc6449c2de08b68fbf289d5435deb1df2da06d132795f
font_01_sfnt_off0000e9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DB 10328 bytes
SHA-256: f02a63c8a6f72ca322a427daa2f12b38451ee5c1d1898036901dc13e34b2fa1c