Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ceff66d4f05815d…

MALICIOUS

PDF

78.1 KB Created: 2021-09-18 22:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 034a5be8e83de8b87aecbf32cc3d52c3 SHA-1: 6659eb59264fca03ddd53aabfcd21a6eecba7e67 SHA-256: 8ceff66d4f05815ddcef3dd1323b80059ab7ca0b9ea4636a64d7ffbf176ee929
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to other PDF files hosted on a variety of domains, suggesting it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, possibly to distribute further malware or conduct phishing attacks. No scripts were extracted, but the structure strongly implies a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://dogalakustik.com/depo/sayfaresim/file/woturoripelax.pdf In PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-4/20210904192949452830.pdfIn PDF document text
    • https://coevent.ru/upload/files/28526254559.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/62866436350.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/rapepozewub.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/gogesatokarikod.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/22423842389.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/lisejinuxudo.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/gasev.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/pidagavodaxipajom.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/40473145160.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/60194367963.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/66924994721.pdfIn PDF document text
    • http://novafish.it/userfiles/files/weben.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/61913091693.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/tipagakitodomewukig.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/vofigov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=aristotle%27s+definition+of+a+tragic+heroPDF 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_off0000cd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE513 17904 bytes
SHA-256: 6732b6bef06f29a7796461c1051d7e7295299fbe5929b558937a736c811361c1
font_02_sfnt_off000112dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DD 10772 bytes
SHA-256: 68355fa9feabd77be71726ebf387a41cd7e504210415ce1e573b0fa8da90b216

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