Malicious PDF — malware analysis report

Static analysis result for SHA-256 5301c7cdeca152ff…

MALICIOUS

PDF

86.5 KB Created: 2021-09-10 19:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: df8cb05bc62164ee709e37e13aa11599 SHA-1: 81519b7a25df111fb0670a0171936b3948488d1a SHA-256: 5301c7cdeca152ffd686dbfb615a569da721a75cfe35785abd634f36b1cc3bb3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document is designed to redirect users to a large number of potentially malicious or phishing sites. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=best+logo+designer+app+for+android PDF link annotation
    • http://idominjazz.com/fckeditor/userfiles/image/favaterawiwunar.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/43455594407.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210907153440_2045638279.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/41058650036.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/52493558086.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210905072056.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/s6n610sp9im97d9olcej8o0nm7/56099223396.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/6178377295.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/godarivasafojugaropozudog.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/tafevovufone.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/lamurekoposodiwozumisik.pdfIn PDF document text
    • http://ropesadventure.com/d/files/97714645511.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/datexonazo.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/23788912622.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/parasebegopuwelapugeteve.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/29517992249.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/lugelomosow.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/62604295821.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/nesoduze.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612efe49a3a09---xubububudugapavegewufa.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/35155225337.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/dipuxolaret.pdfIn PDF document text
    • http://www.depomatrial.com/file/raxuxulakibijek.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/nafugazi.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/81274311355.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_off0000ede8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE8 10728 bytes
SHA-256: 8aaaebf519f5b8ba50bbdc8e02a4f0fde6d3c3fa0c423c364af65293daa48f8a
font_01_sfnt_off00010676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10676 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E88 17632 bytes
SHA-256: 305b18557e73d0336840fd1369d51bb38e523e2c4a84e6ecb9c26afa13a0414c