Malicious PDF — malware analysis report

Static analysis result for SHA-256 6824b2f10ae5af0b…

MALICIOUS

PDF

87.7 KB Created: 2021-10-06 12:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0d557ec8016e7af297592aa41f0c87ce SHA-1: 066f07e69e9b7a172803bc516c6510265f42bcb0 SHA-256: 6824b2f10ae5af0b214cbbe6dfe59ab1fd64332bddbaecdf3e07eb3d43e98e23
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with critical and high severity firings. It contains embedded JavaScript, which is often used to redirect users or download further malicious content. The presence of numerous external URIs, many pointing to PDF files on disposable hosting, indicates a link farm or phishing campaign designed to lead victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://medvor.ru/uplcv?utm_term=how+to+earn+free+gems+in+coc PDF link annotation
    • https://nurea.se/currency/userfiles/file/teriwilevesefodolomuva.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/subiji.pdfIn PDF document text
    • http://jfe.hk/userfiles/pusapo.pdfIn PDF document text
    • https://reha.bg/content/upload/file/xogikedemumexat.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/72792477310.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/a9d545219623c86ea20435a7f51e4d70/74279226599.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/10403841358.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/55232550114.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/84661841145.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/gamazijitofupufa.pdfIn PDF document text
    • https://fultoys.com/userfiles/76100909139.pdfIn PDF document text
    • http://cascad-trans.ru/files/firajomumukesazarubaruten.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/faxaxonarojibe.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/16627608334.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/nodadiguvod.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/durapimala.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/bakaluwivitufim.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/pobakutiw.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/wedopibijoxurunepop.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/simalofomefuz.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/munije.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/7606460979.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210921_FEF1D67F459754FB.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/wesogefuwitidetuzirujiso.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/58198127436.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161571ecec3390---suwuwiwalitibisuxezet.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/39894735926.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_off0000ed63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED63 19464 bytes
SHA-256: 34ada0c56ade4fdcc5f786fe25d83ecfd4e3b9ea8a5371971bdc960ed287cf55
font_01_sfnt_off00011ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFA 10712 bytes
SHA-256: 595a476c1564281f7422217eac6f25ea8c1094dc9eb7cc2c321feadfc34063fc
font_02_sfnt_off0001389e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1