Malicious PDF — malware analysis report

Static analysis result for SHA-256 b32f7f8c54551f1d…

MALICIOUS

PDF

67.7 KB Created: 2021-09-27 08:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bd141629fdd2aabdd73fb3ac6db10b61 SHA-1: 87f32d82119088c83af64802b43deb9cd19d661a SHA-256: b32f7f8c54551f1da18ab9e590a76524b5d0a21675289b677234d20d0d4fb619
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to numerous other PDF files hosted on disposable domains. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://daliangluyinpeng.com/userfiles/file/jutisuwumij.pdf In PDF document text
    • http://acrclubinversores.com/files/galeria/files/44366796976.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614707122f536---77293466241.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/xogepevakinuje.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/kozapemofake.pdfIn PDF document text
    • http://immodraft.eu/images/architekten_agentur_images_/file/sedodufavubufijapoxata.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/67552909141.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/40946582055.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/67496205574.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/2237439851.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/golifap.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/49388536624.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/5361379123.pdfIn PDF document text
    • http://csigikes.hu/admin/fck_upload/file/bavizil.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/66292451059.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/71421631294.pdfIn PDF document text
    • http://rc-modeller.se/images/file///gebanid.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/nadixibodapipuzabobeda.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/26960266967.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/67795222418.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/kisemapamor.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/gusik.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/37287514896.pdfIn PDF document text
    • http://mq-water.net/upload/zipazaxoperatenokemar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=offmp4+apk+downloadPDF 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_off0000ae26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE26 10352 bytes
SHA-256: c951b1bcb01517aa82502ae2e2874ac7fa12da770a78e880a840b0708bc16865
font_01_sfnt_off0000c591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC591 14544 bytes
SHA-256: e1efcc87a22c66592b84f09e81d633185606e2979580c36dc155722a9739f264
font_02_sfnt_off0000e97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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