Malicious PDF — malware analysis report

Static analysis result for SHA-256 2af992fb9c833a28…

MALICIOUS

PDF

89.2 KB Created: 2021-10-10 00:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 322759adcae9d8c2f9032e1d9fdf7510 SHA-1: 3a87b820e30f002f95812d7bfeadb6867a0d2ba3 SHA-256: 2af992fb9c833a28b3c5dbb09f0de0ecb9ef057f9625f1febbf02082b09cf365
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a medium-severity heuristic flagging a link to a raw IP address, indicating a potential phishing or scam lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL distribution are consistent with a phishing campaign aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://contact-house.com/fckeditor/upload/file/81442199520.pdf In PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/19598716393.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/82779437919.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614638ae07a2e---84690697467.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/56485271281.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/79803740513.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/najuwukisapekusuzezat.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/91673944936.pdfPDF link annotation
    • https://myvideoclasses.com/ci/userfiles/files/51412968955.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/73836487718.pdfIn PDF document text
    • http://yljinbiao.com/admin/upFile/2021-10/file/14791376832.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/2228535476.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/lomafij.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/kavaru.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/64575613364.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/37961075797.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/90391951853.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/bizidesidubexuwesef.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/5413205821.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/libesujipojakuxevimebin.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/jemuserepuzamogazidasaka.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/nitan.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/sugemegazuxuduw.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/20743410881.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/butesefuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=hiccups+at+30+weeks+pregnantPDF 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_off0000f3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C5 19376 bytes
SHA-256: b695e82faa21d4fc087cb523d0e9908a3fb49c5de8a5873a83c13bc4ce54d655
font_01_sfnt_off000125bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BD 10948 bytes
SHA-256: fc08f01d726954d84778e4b4dbec4952ab4aec48cc443ecdde4d14b7d50a6fef
font_02_sfnt_off00013f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1