Malicious PDF — malware analysis report

Static analysis result for SHA-256 071f254b35d37a7f…

MALICIOUS

PDF

74.0 KB Created: 2021-09-18 20:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 925836d48d3bb1d0f2378c6015b1e824 SHA-1: 837b90ce7d871c5b8bf52ed4d5f6a70e3731a249 SHA-256: 071f254b35d37a7ff6b114c03ca839abc426c46bb7d062519282e91835d706b1
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or malware distribution attempt. The heuristic 'SE_CALLBACK_LURE' further indicates a potential callback phishing or tech-support scam context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://philabc.ru/uplcv?utm_term=interchange+intro+fifth+edition+pdf PDF link annotation
    • http://clinicaveterinariagoitese.it/userfiles/files/35511928772.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/38558686900.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/26506909721.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109111659252420.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210902050648_996289948.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/sinigejejuwelagesexizim.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/kevuradojujanaxapele.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/95333916770.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/bfd44039d02c600740bf84d6897d25a2.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409aed117c7---44044894571.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/ladamidosimesemilibevi.pdfIn PDF document text
    • https://grup-rul.ro/printuri-fi/files/derelobobanujagazawekif.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/vazusosovepirabumaroto.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/gelelusalukutabidefano.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/50602763022.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/72881363904.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/piritomafazugubi.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/texafexafekovinam.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/77519471948.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/41555707492.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/61559601779.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/todaz.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/pigagejuzabegesasadel.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/lafuxiriboxodafovoditizu.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d30778e90---jiwawebejuwamopobi.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/tolejifeleba.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_off0000c06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC06D 16192 bytes
SHA-256: d7164b77574334dcdb6b75a0a775cbc503c28e6526dbf603f9b167e0929b0e52
font_01_sfnt_off0000ea1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1E 10636 bytes
SHA-256: 7f855dfec8e71fcd5ecab7a33a16ece45d0e88d15775a2403100d57648be3ebd
font_02_sfnt_off0001022b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1