Malicious PDF — malware analysis report

Static analysis result for SHA-256 58e671bbaf676412…

MALICIOUS

PDF

71.4 KB Created: 2021-09-16 10:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1892bdb83ad2770ccc24823f39af07ad SHA-1: 13f485d8b845d5c218891414d9424e28bbddeb2a SHA-256: 58e671bbaf676412971c0e9c2f93c6a5fa111371f35e3b0ea11232fd49795b74
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of exploitation for client execution, likely involving JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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.
  • 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://stlnsk.ru/uploads/file/visaxogogujixe.pdf In PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/kunax.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/zekak.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/rexosizokanafomamisakana.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/paburejenonuxomolijox.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410d6dd026a---wakaverosogulage.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/wuvagatu.pdfIn PDF document text
    • http://bibikid.ru/upload/kinezegixoxigojit.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/dovitalepolutiwubasizute.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/gopaf.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/99940278883.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/40183346289.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/fapemipenemefijere.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/vafojuj.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/xinaw.pdfIn PDF document text
    • http://a-pluset.com/userfiles/19056663523.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/48040239145.pdfIn PDF document text
    • http://exim5.hu/_user/file/belagixej.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613127f387a42---19891379061.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/mexaxubifazup.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210914135608_484705924.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/27683226368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=tab+menu+androidPDF 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_off0000b55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55B 16764 bytes
SHA-256: 30ef28ce66577a2cef4acdc1e76821c4fb8ee02816e600b14f79ed72c24e8312
font_01_sfnt_off0000e0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF908 10300 bytes
SHA-256: c50b7821b7feb3e2806139b6f9f9e1cb4beb0e4b8474423ed2f2988f1b4e1b29

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