Malicious PDF — malware analysis report

Static analysis result for SHA-256 437331e5f334dc56…

MALICIOUS

PDF

75.8 KB Created: 2021-09-21 01:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7bdbbcacf57d1e4648dbfe2d1217f733 SHA-1: a9c936bd97453928dc7f9767941f573caeb91ff6 SHA-256: 437331e5f334dc56c2bae40e48c745436475dcf47f1300c3e7f0146d766b5b67
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains an exploit. The presence of a link farm heuristic and numerous embedded URLs suggests an attempt to redirect users to potentially malicious content or for SEO poisoning. No scripts were extracted, limiting the analysis of direct execution vectors.

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://ildungrice.com/fileupload/fckeditor/file/86374442621.pdf In PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/jiwepegenojuxevem.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/48424792420.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210921051255_bgl3a8.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/27023472430.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/19684600539.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/53273742588.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/71710592803.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/kimopajazinutomidobobef.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/wofuz.pdfIn PDF document text
    • https://durimawar.com/contents/files/pumoden.pdfIn PDF document text
    • http://fourfoods.com/images/files/67806927759.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/tumodotoxakigogevefuso.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc865de822---38342060458.pdfIn PDF document text
    • http://synphabase.ch/upload/file/2702014305.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/tizuziwovi.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/mepezazudavipuxuvumuriri.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/lufataw.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/83570840326.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/8298925311.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37122106672.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210902_210956.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/25480560047.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/66877482532.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/55272781788.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+green+witch+pdf+downloadPDF 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_off0000c2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C9 10780 bytes
SHA-256: ba61a0e6e63b47e65a94ab6bffd2f197ea2403c1280cb32f54f62a304665e4e0
font_01_sfnt_off0000db60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB60 17812 bytes
SHA-256: eb5f1ecb8ec71a3711c8cabc8fd9565caca45d33fd47355f7c747398c285c756
font_02_sfnt_off0001096b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1