Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf77a75b5645d4f…

MALICIOUS

PDF

74.5 KB Created: 2021-09-14 00:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 995d87da81af73251eabafca0a084467 SHA-1: 60a2e73e1e87998bb930aa642e6326dd50ad6b0e SHA-256: fcf77a75b5645d4f5709165b8dc4c5b4de4d2703109c6b4e71334c1bfc32e02c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to disposable hosts, suggesting an attempt to distribute or redirect to malicious content. The document body is unreadable, but the presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://basyapiemlak.com/yukleme_klasoru/userfiles/file/23425086031.pdf In PDF document text
    • https://phunhai.net/upload/files/76665421081.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/lidije.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/54290635902.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/91301935335.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/86067780575.pdfIn PDF document text
    • https://nomortiga.com/contents/files/50887137419.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/16333665743.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/bcefa29d869c66aa4eaf0bc3f6400b94/wedokipivuwimebuvakozijav.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/40677134267.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/xobeberitofudaxidonosu.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/246211113.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/27343464331.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/40292197141.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/12860919820.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/piwetoririrelamaru.pdfIn PDF document text
    • http://wajl.net/img/file/20219135920.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/15686981684.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/duzumituwulomopipemud.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/23814290345.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e02daa1771---38245164723.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/69551026739.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/86224797446.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/90825856026.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/87443946494.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/lubokosema.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=malayalam+remix+mp3+songs+free+download+2013PDF 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_off0000bd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD92 16660 bytes
SHA-256: 7a3054d1799e2efb1e67df76a96eb575b527cfb573b4ff94c8ba9d35d34ef3e6
font_01_sfnt_off0000e883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE883 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001009a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009A 11504 bytes
SHA-256: cb5f8cae574f684efbb779cb224278c0e2e88d76b51c13dfb656d62f3a5defcd