Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f55fa89262ba363…

MALICIOUS

PDF

80.4 KB Created: 2021-09-19 03:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7755499b396c1c5af92f67f6e5562b57 SHA-1: a32ce74f8d4e3e1edbde9f88f327b97b38147012 SHA-256: 0f55fa89262ba363af9f49fc077d534a8d47de8cc2456a85472cc67be1c8f0bb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous links to potentially malicious or disposable domains. The presence of multiple embedded URLs, many pointing to suspicious domains, supports the classification as a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://diakmelo.hu/ckfinder/userfiles/files/61582070298.pdf In PDF document text
    • https://redac.ch/upload/26236239148.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/4056372693.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/nanon.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/95902172832.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613645d8d9639---82837701038.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/rigujoximijudiwisifiziv.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/42618022884.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/gojobinosebe.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/10483429514.pdfIn PDF document text
    • https://iword.de/userfiles/file/birewagadowunejixeju.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210918022450.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/36972557580.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/98139546583.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/56357012078.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/gemuwuwimejorarejegu.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/15410970157.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/luwurewavizabajakugita.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/vedoremisesoxisuvum.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/65537913790.pdfIn PDF document text
    • http://coconut.hu/userfiles/file/bibowefovafatujijeruxulox.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/27392087974.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/21557910084.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/00a433dfcff547453831ff756675e797/bozonamupobarazapumet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=floor+plan+creator+apk+fullPDF 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_off0000d842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD842 10380 bytes
SHA-256: 79f20176eefc0c9743799448b3c5c5c4d2b937b5c121ed0615647f6cbf9a320a
font_01_sfnt_off0000efdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDC 17124 bytes
SHA-256: fcc3aa1fd596aa904f7a81be90370a3a4599fc7c48279236aa72b69cc87bd6b4
font_02_sfnt_off00011c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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