Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d3aa9817030f71…

MALICIOUS

PDF

70.3 KB Created: 2021-09-16 10:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: db5ea805b11e962ab6a494e47a2a31e9 SHA-1: 84fd1cdc005e086deb632803d9f6fc748ea87ad0 SHA-256: a2d3aa9817030f71e6ef72432827275509f50fae9fe3884b6e8bb588da66851a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with one specifically pointing to a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a deliberate attempt to obscure the final destination by using multiple disposable hosting domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://inwebjor.ru/uplcv?utm_term=rovercraft+mod+apk+android+1 PDF link annotation
    • http://bolt.fo/public_html/userfiles/files/46085497652.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/guzejufod.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/tuvitudafukotepo.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/wivizekipofofir.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/tisiwokozapuzezesolalobe.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/53109385705.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/21577217520.pdfIn PDF document text
    • http://dmkert.hu/files/file/83941495693.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/kepuditevajubedut.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/62526794773.pdfIn PDF document text
    • http://wenfengsi.com/wfs/WebFiles/file///2021090311485524.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/37733490806.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/gimifaloguvila.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/46909121537.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/wuvumi.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/3f05da12dac52153863e495d101abf55/37987587493.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/zabepelutuwuta.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/23750971120.pdfIn PDF document text
    • http://446888.top/userfiles/file/51812994393.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/numobanitotidenolad.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/zotojurowuroliz.pdfIn PDF document text
    • https://wonkingchina.com/d/files/81062973634.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/39009378623.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/61008909708.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_off0000b338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB338 10824 bytes
SHA-256: 1ce77538d749bc550395dc0b07d6ec085eaf79098f01866fa301cd790b9d6e87
font_01_sfnt_off0000cc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE455 15496 bytes
SHA-256: 4b27d5ff1d474806a9412645902f603e03910d457f611fef70da42a0fe4beae8

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