Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c59e4805a336722…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 09:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 28f4c080d29b46a91d342970bfad629e SHA-1: 9c5553b354a42a1501f6edd573d318afa5d81ffd SHA-256: 6c59e4805a3367229508403af2ef011b0ef10b6eb027d1387c28327500c548bb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to disposable domains, indicating a likely phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of embedded JavaScript suggests it may be used to execute further malicious actions or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://mateuszkucharski.pl/admin/file/foseraxibawo.pdf In PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/duboxofobiputuvopig.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/dofejosojebafasemomogapuw.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/wazesuvekazekajux.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/32644674617.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/13594614609.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/84745467487.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/nigev.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/93423433357.pdfIn PDF document text
    • https://umartravel.com/files/zodigiwunijetomivavalaka.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/zogubu.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/74761689747.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/49286384609.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/rerefodolunewukexa.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/41827866734.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/worof.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/bejufas.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/gipobemagunilezajinuxofiw.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/futivizukikikez.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/78722763826.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/nugekigavubagerolot.pdfIn PDF document text
    • http://vititanon.com/user_img/files/74444285372.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/jexizepexurilusozul.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/pexukijidibegolexineluk.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/5125383856.pdfIn PDF document text
    • http://jawarakreasi.com/file/3112266309.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=where+is+the+android+recycle+binPDF 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_off0000d8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E1 10712 bytes
SHA-256: 281eb1306a1e1640f7d26f5aeca01b2d3611490f3a5186ba5122f0ebae3f15a6
font_02_sfnt_off00010977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10977 16756 bytes
SHA-256: 9ae296b28063e34d6d1b113575261d71bf55d65fc11c3beb935b6d16931f11a3