Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed1d29cb3a5aeffe…

MALICIOUS

PDF

89.5 KB Created: 2021-09-17 14:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9242a6c57d75e2acd88a6425ba07b679 SHA-1: fdcaef45a4f3ab49d00ede6372970fb5ba1f0155 SHA-256: ed1d29cb3a5aeffe7d42e0f03624ce57da8c7ff41215018d046d1149c85541a5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://huntic.ru/uplcv?utm_term=encouraging+words+that+start+with+the+letter+c PDF link annotation
    • http://bakefruit.com/uploads/files/202109090253381888.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/xilazogafan.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/29300251797.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/tuxamorasenena.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/40615761585.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/89026160160.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/3924336695.pdfIn PDF document text
    • http://protezas.lt/i/File/56019782313.pdfIn PDF document text
    • http://homeopathyhk.com/files/fosubotigofiloguw.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/jarufataxeranexivijo.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/78599485879.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/15556491201.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/78671312477.pdfIn PDF document text
    • http://www.praasia.com/file/files/xomepubozusexabi.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/67987776389.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/92925192273.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/gozubufazofukamupove.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/30664644014.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/17/noralid.pdfIn PDF document text
    • https://breedlife.com/upload/files/sagulibisom.pdfIn PDF document text
    • http://cbstav.cz/file/moxuvedinuvizajap.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/22162655716.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_off0000f809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF809 17744 bytes
SHA-256: 4880bdafeddb56d29a693dd0a63e2a479120faa3fc645cbdc804ef6046f786dc
font_01_sfnt_off000125d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DED 10820 bytes
SHA-256: 72b0b322a6d21d77c020cf9055883ff8723aaf6cf465f0afaa724799cabc3f08

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