Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f446d7bd3edca24…

MALICIOUS

PDF

74.4 KB Created: 2021-09-11 20:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5530c6b3a50209cfd2d86302fc92e127 SHA-1: 81f14723e5f1da48adf9b13316e812a2e9fed9dc SHA-256: 7f446d7bd3edca248e190212ea6fa50fa943bef042f2cbb510cf922dfab68c96
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs and is structured as a link farm, with many links pointing to disposable or unknown domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://nriloan.jctoursandtravels.in/files/davenagufetilugadowedivu.pdf In PDF document text
    • http://yushendesign.com/images_fck/file/1630517542.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46210998367.pdfIn PDF document text
    • https://laser123.com/geektic/files/bamavugepevixugenu.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/zofato.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/kanalode.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/84828395131.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/49751738598.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/97298480353.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109012034097888.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/niwajifikakik.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/98308783904.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/vorawutisanunekeb.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/84311018228.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/30480977607.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/49412342959.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/42485313798.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/94298340576.pdfIn PDF document text
    • http://vhktn.at/images/content/files/tigojujatitixelumi.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6c55ec3f2---zobesadisigudimetanixi.pdfIn PDF document text
    • http://metall-press.ru/files/pumum.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/jugowebururawadaxevoruse.pdfIn PDF document text
    • https://alohasafaris.com/files/93271116944.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210909151806.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+hack+8+ball+pool+iphonePDF 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_off0000c05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05A 16792 bytes
SHA-256: 93a2761ab2df344abee3a5a69814e4bd4965284498075e7e7bc2765e9bf21337
font_01_sfnt_off0000eb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AF 10720 bytes
SHA-256: fb3ed5788f343babb3c28e4133c9bda7c59b9f4007256829746acaf659750cd1