Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd7ba9bd29341500…

MALICIOUS

PDF

98.3 KB Created: 2021-10-05 02:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fa64dae41c6f652355e5354d34f5ae9f SHA-1: 1f7899742041198ae9a29b37736f8c89de61fc0b SHA-256: fd7ba9bd2934150014233cadec1a03bf13162052bd159ca6f6bce5135e38c03d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple external URIs and the 'SE_INVOICE_LURE' heuristic suggest a phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common pattern of luring users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://originalbau.hu/imagesfiles/luropuro.pdf In PDF document text
    • https://dursunguney.com/userfiles/files/13990948955.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/federetemakabe.pdfIn PDF document text
    • http://xn--5dbfbdrd7azav1bcx.com/sites/default/files/file/13950710971.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/47248934515.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/8482312771.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140b3a76cbfd---53756232596.pdfIn PDF document text
    • http://mfahk.com/upload/files/fipiwaxiwurubetif.pdfIn PDF document text
    • http://klemanpince.hu/files/file/xakapu.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/fiwosunivarufan.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/55091843588.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/71888770079.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/wefotabokofosu.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/najuzoxasonumufowutasari.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/noxikig.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/49621089751.pdfIn PDF document text
    • https://tahsindincer.com/upload/ckfinder/files/81030472321.pdfIn PDF document text
    • http://huarong-bio.com/upload/files/2015155342.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614e07158735a---45096274073.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/pupiterupumu.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/wudivijozifufaw.pdfIn PDF document text
    • http://erictex.com/ufiles/files/vovosilefumixanefalufu.pdfIn PDF document text
    • https://bagstyle.uz/images/file/49272056253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=thank+you+for+your+message+synonymPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10054 17192 bytes
SHA-256: 736bad5b1f990d62aed4ecf6620ce51020afb900679dca4ee8c145c7c85029fb
font_01_sfnt_off00011977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11977 19064 bytes
SHA-256: 2c47708b662498004968592c792017fa9b72441b614a54d4a4b9771e826ae693
font_02_sfnt_off00014ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AD6 10696 bytes
SHA-256: 3f0c9758693a57bce7bfc7d4340c36acf9385059e356b325f179803e6a71bfa8
font_03_sfnt_off00016340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16340 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1