Malicious PDF — malware analysis report

Static analysis result for SHA-256 e596c5b73a22b665…

MALICIOUS

PDF

76.2 KB Created: 2021-09-11 03:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 895f77f85605bb0e903a026020ca5642 SHA-1: 6fdbecafb10b89606d6e51583323b4e16cdb8212 SHA-256: e596c5b73a22b665a35d626143b7c230ad862ba64ef435f4b54de51890236c2f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, identified as a link farm by heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

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 http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/gizajafijeberewu.pdf In PDF document text
    • http://quaint-house.com/images/blog/file/73741251413.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/57837702713.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/45159765312.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16137116cdcfff---78132325873.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/mitogefo.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/87725721597.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630950799.pdfIn PDF document text
    • http://umartravel.com/files/nojepixu.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/lavebuxefosubekiber.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/2687333270.pdfIn PDF document text
    • https://5uempat.com/contents/files/49024110426.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/32559543099.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/zuzeniferomeja.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613797d1b0409---40659612691.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/16196753212.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/26664675441.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/gulokosomugivevebejexuvog.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/tizes.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/42410452061.pdfIn PDF document text
    • https://ibericadearmerias.com/file/47722249772.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/78008392527.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/80664137980.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/mubupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=deadly+pickup+movie+123moviesPDF 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_off0000c3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBF 11092 bytes
SHA-256: 129d2dde3df41956d9afeb8d81e7f7e6b7c74f0184825d0e5e6b5a1c6ecd3edc
font_02_sfnt_off0000f5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B6 17484 bytes
SHA-256: 500ce483ea83a6e8a65e97c2962c196fff3a3e64d881f610e7bb7288b6401434