Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fd0f95dcf377963…

MALICIOUS

PDF

90.3 KB Created: 2021-09-21 20:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: aa4836ebfd4ca0f3e56d1c557bf62f0f SHA-1: 94a6bf5834112e1f6038982b21fa0a744976bf05 SHA-256: 2fd0f95dcf3779635f12e899b7e9abf4a4055fe55879e602f2a3eef930cdbc4c
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or employs social engineering. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to redirect users to a large number of other sites, potentially for malicious SEO or to host further payloads. No scripts were extracted, but the presence of numerous unknown URLs points to a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/87994966374.pdf In PDF document text
    • https://uclerbaklava.com/resources/file/66998461949.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/29220609549.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/75079186128.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/vojufekinoka.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/5296531350.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/32714662605.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/jamobosidugagaso.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/39123609653.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/32445548586.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/70718609501.pdfIn PDF document text
    • http://kelakewangshangduchang.a9188.com/upload_files/art_files/files/20210906_173122.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/wupuwekavuvujojivexipajiv.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161377098d1ef9---10858280196.pdfIn PDF document text
    • http://wernitznigg.at/files/fifetewuteniwusikukibasev.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/libajazupakimiserevulumaw.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/wamoziriwubijoxegizesopa.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/wozunedezaxes.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/94452644932.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/34717556642.pdfIn PDF document text
    • http://prograsifkalip.com/files/20354518845.pdfIn PDF document text
    • http://xhslsh.gdx.cn/ckfinder/userfiles/files/44980118715.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+walking+dead+season+11+last+episodePDF 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_off0000fb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11349 18564 bytes
SHA-256: 4da44c091e4202807ddf32e9403b8dc9424715353c7a228c71af302a8304f998
font_02_sfnt_off0001433a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1433A 10764 bytes
SHA-256: f9389ef1d34b95133337319df63602fe969a03d208337d0f97d5d52df4d217b0