Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7912d1e62dc25e9…

MALICIOUS

PDF

81.5 KB Created: 2021-09-12 15:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ea25feecaa2c711cf86aae34dfe47d92 SHA-1: c5c715d4e7cbcf0212113662657b8e1fe615824f SHA-256: c7912d1e62dc25e9be2725fade0ec3d3ad11d7e5d4fab135536fbfcd6d333040
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The embedded URLs and the PDF structure suggest it's part of a link farm designed to redirect users to malicious content, likely a phishing page or a downloader. The presence of multiple unknown URLs further supports this, as they are likely used to host or distribute the final payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://rallstarawards.us/nbloom/fckuploads/file/24760769616.pdf In PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/mivafelunixex.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/17311895404.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/26362643350.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/xizobizevexugigipajibifub.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/vatevojalisaraxitim.pdfIn PDF document text
    • https://websbag.com/uploads/files/binagobakiliwix.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/biroduvixojopuxemif.pdfIn PDF document text
    • http://skncn.com/u/files/xatomo.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/bovawagabu.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/pobinibawo.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210907_055715.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/22591354598.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/af2736d31503c67fc542c525cf5d8484/31290110370.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/vokukakidel.pdfIn PDF document text
    • http://analhospital.net/file/files/xusifopebixolim.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e3ff94b69---gominitunoxelolonuv.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210908155001.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/10430435685.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210909151921.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/munisixelabajewotewigon.pdfIn PDF document text
    • http://clerus.hu/files/file/kozekosikajijadidizaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=vani+meeting+share+screen+app+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_off0000da11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA11 17432 bytes
SHA-256: ca7f225959e1626c0e471cd51c9c3f3b085ccf3a5ddd27553bff31d0bf41f0ad
font_01_sfnt_off000106d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF0 11016 bytes
SHA-256: c2c39ca00138b6a17ebeffeb4319c1d7b056a731529482c825ae4e57ac9470bd

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