Malicious PDF — malware analysis report

Static analysis result for SHA-256 a65c2858f873f9a9…

MALICIOUS

PDF

86.5 KB Created: 2021-09-18 01:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6bd4fb00a67513dd13032b87af2bdc5b SHA-1: 8a261622e4bf5acae35449643e8a61af61bbfaa3 SHA-256: a65c2858f873f9a9ef3ff3f0e259d34f82ed4857f8f29f164cc8edf96fb12343
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate it's a link farm on disposable hosting, and the presence of external URIs suggests it directs users to potentially malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://allytemp.ru/uplcv?utm_term=screen+mirror+iphone+firestick PDF link annotation
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/8961990218.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210918_ECAD4B1ACA3B2C5F.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/refodi.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/todavimegibodapugulebi.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/safobosomufijidaziduk.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/luvizipalasibuwonuwamixi.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/20816176793.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/31596526637.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/wunur.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/977f6fe10427b5d1286fd751bbbd52b4/sokomifo.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/pegukezago.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/zixuzasuvarafoza.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/51765909816.pdfIn PDF document text
    • http://co-mit.com/uploads/files/nawepewa.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/58791202043.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8a116ba4c---46577239498.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/jusuzonejaganamodudamufoz.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091802432240.pdfIn PDF document text
    • http://fteq.ru/files/file/tomebonevigijadibalag.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/janip.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/13833742034.pdfIn PDF document text
    • http://fmdscu.net/userfiles/file/didoniridafefinok.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/kezepolapupifif.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/89288184533.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210918052219.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/dimofaresan.pdfIn PDF document text
    • 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_off0000edfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10611 10704 bytes
SHA-256: fa5c72e1c95cc1f0270d313f3685d63c88cf316dd353718738bc01be55c3cd59
font_02_sfnt_off00011e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E65 17608 bytes
SHA-256: 1c5e3be2fc1bdbc51edd6bf6ce38248cc5e16eccf5c278d1f7a9ebc59fb655f6