Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33589551cbbdf78…

MALICIOUS

PDF

75.2 KB Created: 2021-09-27 00:33:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c474be7f42d9394e0c346005071e8d49 SHA-1: c7b50203c4dbaa0091b8f16d1dfacf09ad2c3ba3 SHA-256: f33589551cbbdf780d50949869662967fb4ec2a124876cf58c948aed18022743
126 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. Heuristics indicate it functions as a link farm, directing users to numerous external PDF files hosted on various domains. While no scripts were directly extracted, the PDF structure and the nature of the embedded links suggest a potential for JavaScript execution to facilitate redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 5

  • 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.
  • 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://xy-interior.com/uploads/files/202109130849147561.pdf In PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/sulagarovefi.pdfIn PDF document text
    • https://bagstyle.uz/images/file/risesidog.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/gutolirivopanawezururemi.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/81326379312.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/1828787386.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/wakufumuzawes.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/pazamex.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109200700489858.pdfIn PDF document text
    • http://azizolace.cz/images/file/28406484653.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/jivutovopalafaxuloba.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/xafogolaviwege.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/49178445085.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/56230452921.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/bozifajutosimi.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/mexan.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/56331057535.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/pevami.pdfIn PDF document text
    • http://519pf.com/userfiles/files/depaxabubufokovonujewif.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/78824384005.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/65302564477.pdfIn PDF document text
    • http://salwex.hu/file/85095048255.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/78574103621.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/gokedisojetaxis.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/tagebaso.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/maroxeguwiredutelafesutag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ski+safari+game+unblockedPDF 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_off0000baaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAF 11128 bytes
SHA-256: 1cd06e28215003b78e8ffbad9f4569360ac0574a0c724c8dce970bc41aaabf27
font_01_sfnt_off0000d462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD462 18904 bytes
SHA-256: e4d0f2ba12909b690ebeb0f54aba442834d9c43ab593b8b89c9a4cfb16a63038
font_02_sfnt_off0001059b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1