Malicious PDF — malware analysis report

Static analysis result for SHA-256 84685d0ad516ba93…

MALICIOUS

PDF

78.6 KB Created: 2021-09-08 17:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6be6b4a82f7953db984ae6852ac56c6c SHA-1: d4d3600b8d9726d512707e363ce9184671d8e7b7 SHA-256: 84685d0ad516ba9398d95b95c9f2939190b0a069a82bdecf3eadfa1ac65ee352
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF structure and embedded URLs point towards an attempt to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://krisoc.ru/uplcv?utm_term=drawing+basics+pdf PDF link annotation
    • http://cuacuonbinhduong.com/upload/files/23269110551.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/79492360508.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/67596693040.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161302f405108c---fasixuvubivitonaduxaguli.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/jaxinotigaxamubapikigodun.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/bumapitajogexadim.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/69931918249.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/tinami.pdfIn PDF document text
    • http://hmed.vn/upload/files/85459970155.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/50611141831.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/86396509028.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/78238223401.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/51445417827.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/norevoxuzuvofuwisigaw.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/72811688560.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210901122050.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/fujaduvuvajo.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/46429722319.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/18741042375.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090302194162.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/3920303719.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/62726014273.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/ravofe.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/58261973806.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_off0000d2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B4 16432 bytes
SHA-256: aa733dcf46fa087b14143d1bb4c88e7e63399bfced680ed30c3db9d5b5556a8f
font_01_sfnt_off0000fce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE4 10624 bytes
SHA-256: 4ff23cd06b3ee06803181183a82740c9fd1144fc2014d28515976fc76be7679e
font_02_sfnt_off000114f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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