Malicious PDF — malware analysis report

Static analysis result for SHA-256 512deb3252e2f650…

MALICIOUS

PDF

69.1 KB Created: 2021-09-18 17:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 73c2dc19587e8f44cac0e48c9445a6c2 SHA-1: 39160a261cc8780ef485ec5c3d497442c96613b1 SHA-256: 512deb3252e2f650d29a87ec2b1ab88d864a65b1ab7616e68e518a32103fbbc4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The presence of many links on disposable hosting suggests a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit users by directing them to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://queure.ru/uplcv?utm_term=breakfast+workout+meals PDF link annotation
    • http://waycreon.net/bhaskar/yii/upload/files/mimatolazibope.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/tenizakivugezon.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/52252161727.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/vimaxavox.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/besujovumurojuza.pdfIn PDF document text
    • https://emprenderem.cl/files/25077792700.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/mapifixilol.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/25177777214.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/49241857272.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/58102560286.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/girujevejokaluduvapom.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/waxapivebixom.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/12504397653.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c7b2c91dd---93265125049.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301192a2f01---16436204524.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/94881891824.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/28642923786.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/17962826262.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/zukijudafukod.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/4472619922.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/13867403311.pdfIn PDF document text
    • http://plncse.hu/php_data/file/95641078762.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_off0000b24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24B 14616 bytes
SHA-256: 34dcd18775690008c61634f104033a38ed3d62a59aba25aead1ca25df810d625
font_01_sfnt_off0000d6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eeee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEE 10508 bytes
SHA-256: 4603f9bdafdeab8f857f9619b08ca5d25605d0353122c6c97d720e0ded4ec5a9

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