Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c07d97d86d1c3c2…

MALICIOUS

PDF

85.4 KB Created: 2021-10-11 09:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 74b668e9520ea1d1a23f4a8e39d296fa SHA-1: 277409b199006ee38f59f2fe0425f4fc185174b5 SHA-256: 1c07d97d86d1c3c228e4dbe712a15218e48dde4921e5ac13da3be5f2fcd41900
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, indicating a probable attempt to redirect users to malicious sites. The presence of external URIs and the overall structure suggest it is used as a lure, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://rsst77.ru/upload/files/kiwusetasipasabob.pdf In PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/88492397665.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/mozamifubobawodafi.pdfIn PDF document text
    • http://someteme.com/archivos/_20211007033757.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/17142714297.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/55337710866.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/28540888530.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/lekun.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/27109785291.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/63435417828.pdfIn PDF document text
    • https://10fci.org/userfiles/file/jozuruxexapami.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/meteguduzuned.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/vijarirugopoga.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/27026575840.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/vuguxijemuxaxubotas.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/97085687474.pdfIn PDF document text
    • https://denimder.org/resimler/files/gujurob.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/67553853051.pdfIn PDF document text
    • http://livestocktool.com/d/files/16229011756.pdfIn PDF document text
    • http://oembag.com/uploads/files/202110100827533699.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161498f502de95---patijajesivetowefedumoni.pdfIn PDF document text
    • http://wuchem.com/upload/files/mugopasewajixanu.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/16761988622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=perfect+hard+boiled+eggs+for+dyeingPDF 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_off0000e30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30A 19340 bytes
SHA-256: 2717642d4550be50dfa3392fc7778efd6a83fe56d4018b7fd876f13edc10d825
font_01_sfnt_off00011553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11553 11008 bytes
SHA-256: 55d6b86c929ec232a7e8fbb88b723da82a0adfa28ebab9f39cc3b6c394346abd
font_02_sfnt_off00012eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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