Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd2fc2f90e2f36f…

MALICIOUS

PDF

81.3 KB Created: 2021-09-11 07:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3098395b85407f1f2baab3e067f5dfc4 SHA-1: bed9a3a878d327f26f0f989ce92f04f4864b274f SHA-256: bcd2fc2f90e2f36faf8aa3c8eafa70a055acb474671dd4ea4b1a41e57898f607
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, indicating a link farm designed to obscure the ultimate destination. The presence of external URIs and the ML classification strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://tedesco.pl/userfiles/file/wirepaxuwo.pdf In PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/sezivimi.pdfIn PDF document text
    • http://shahgrp.com/uploads/12026108611.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/liwejiw.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/biruwuzusukakogujinemidik.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/xesem.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210907025248034.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/1446540245.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/48739841835.pdfIn PDF document text
    • http://acelybio.com/upload/files/41881406768.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/5804993196.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/60677794061.pdfIn PDF document text
    • http://sushibelovo.ru/files/35435226425.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1613102174898b---sojex.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/goredepamaduvixadokib.pdfIn PDF document text
    • https://baglab.pl/galeria/file/lowedagodemijojida.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/zifirijibugitawub.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/tukepatotonugi.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/gexarilelesebijetib.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/1305047441.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/jugujagifut.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/41149948492.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/52444486058.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/09/file/202109111053124846.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/87344673333.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/tezaxadafezebogolem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=do+i+have+an+alarm+on+my+phonePDF 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_off0000da2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2C 10432 bytes
SHA-256: 6bd88d4c1eeef755e0744fda137f359de8f7b31b0048d24c09c6115ff603c5eb
font_01_sfnt_off0000f194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A6 17824 bytes
SHA-256: 85b2563602bcc815c3f8177b169728638614f6cc7b8cb4ab91560eaa9d1746bc