Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca8f5c50ea670586…

MALICIOUS

PDF

78.0 KB Created: 2021-10-13 08:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f56fdee1df28ce775b89be93f10c4f8d SHA-1: 1883977f2f4b9fea836b439c6b13d8d5e30b3ca9 SHA-256: ca8f5c50ea670586d00ba5a0d96aae0fd2df4e93297aa3c16b844aea73dae4ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to other PDF files hosted on various domains, suggesting a link farm or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating a potential phishing or spam distribution tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://martabaktelor.com/contents/files/26049216600.pdf In PDF document text
    • http://jtylek.pl/Upload/file/63260573268.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/64809363391.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/16099233658.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/ketigerofadot.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/33995706782.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/gejujifezojewe.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/51282161281.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210930_84CE5CDD6396369C.pdfIn PDF document text
    • https://ulsantour.com/FileData/ckfinder/files/20211013_F83AD119959F5DD3.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/rezabijimuvipakizoz.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1631146116.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d75399173a---vewofebusa.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/50168392117.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/retejenuguxibemewugedemet.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/novitalafifiru.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/videpa.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/50424393054.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/vexofetoja.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615fa91c654b3---78129465040.pdfIn PDF document text
    • http://zenpersonnel.com/UserFiles/file/57702534630.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20211008214531.pdfIn PDF document text
    • https://asken.as/bilder/file/xebakukejinoxukeluvate.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/wozebexali.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/2I9n2o-U8HI/uplcv?utm_term=nosql+injection+cheat+sheetPDF 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_off0000cd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2E 17452 bytes
SHA-256: 8ba3e60248bac2843f0afc0353c7ff2cfcd2e3c907173c1317e9c20c09eb4108
font_01_sfnt_off0000fa4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11262 10480 bytes
SHA-256: 92d6127aef011cb2330c67f0ba63a427890b95e1335638bdad7464eb26910b17

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