Malicious PDF — malware analysis report

Static analysis result for SHA-256 732a69f156b19c4b…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 02:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ec43a9acd80f0a0968ca83911a88517c SHA-1: 2fa54ac2efba5a6c73f4679c4444d539bfecf1ab SHA-256: 732a69f156b19c4bb67d2c9361b2e2db2a463d80495bafbfd1c014ddcb934dcf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting it's designed to redirect users to malicious sites. While no scripts were explicitly extracted, the presence of PDF URIs and the link farm heuristic strongly suggest an attempt to deliver malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://catamma.ru/uplcv?utm_term=bottle+o+enchanting+item+id PDF link annotation
    • http://regimhotelierbucuresti.com/images/userfiles/83889555160.pdfIn PDF document text
    • https://geloracinta.com/contents/files/xovomavoloranixuzigap.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/nukakarufum.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/rexilusadagapukasizuvi.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/nesonureresam.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/nexiwaronaz.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/19262424089.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161401ebaecd42---79289184742.pdfIn PDF document text
    • http://rhondachem.com/d/files/6022765336.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/30796641242.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/xanozekaviwoviwupanifuxu.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/85621218704.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/9rf7l3ja50fkid4mlk7oripecf/dotonog.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/42503540204.pdfIn PDF document text
    • https://noventa.cz/media/files/file/33020075544.pdfIn PDF document text
    • https://kalendarz.probik.pl/fckeditor/userfiles/file/soxuwuvitolajuk.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/56205037545.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/9776396268.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/nuvuponojebu.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/rugamekozezunovapam.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/61491210059.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109011102337202.pdfIn PDF document text
    • http://usatovl.ru/upload/fckeditorfile/8920378406.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_off0000da1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1A 10600 bytes
SHA-256: b1d4187138112aa538e9cad5caf2778b77cc6dcb84f6d8ccc09a7c80b5ce29ed
font_01_sfnt_off0000f1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FB 17668 bytes
SHA-256: 6f3d7058d371f49dc93c990eace0bb6b49b9a36cd10e96f3927a26b492a5db47