Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7f87d7d2cebbf7…

MALICIOUS

PDF

74.0 KB Created: 2021-09-21 23:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 78d801340d2bf4d96324c25b04fd6cab SHA-1: 8ea4c320ce6371a06f2bde7eadd63f9c51b6d90e SHA-256: cf7f87d7d2cebbf73b75cff7851159a0bbf5adb64e980ff91fbc8f819f59a4f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm or phishing lure. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit users through redirection, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=how+to+screen+mirror+from+my+phone PDF link annotation
    • https://e-ssuances.com/ckfinder/userfiles/files/40336030976.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/depukupetusezusozuvepak.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/45470799469.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/78254794836.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/20308776417.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/11220678199.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/73382962902.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/bokijavekufuxuginoreturoz.pdfIn PDF document text
    • https://koratspring.com/upload/file/goliresejag.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210919152218.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/65710466054.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ectjgrdptt9fjd0arsr6tiuv86/73586072021.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/livexefadesaledufif.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/32248791120.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/kapubotabux.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/sibaxolizabizezatojusumiv.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/15997184767.pdfIn PDF document text
    • https://andhimazhai.com/images/files/sibefexolosevisupibefe.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/rowulim.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/gilogonijifunuzofogujo.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/tofakusixejonenivefar.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210909_768481B54380B118.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/26469306180.pdfIn PDF document text
    • https://laser123.com/geektic/files/27196349089.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/pigerajuzewolumigibuxelom.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_off0000be6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6C 16796 bytes
SHA-256: baa63c76b93739fcc66b76643fade112cb762c6e0dc502cfe2617ecb6c42349f
font_01_sfnt_off0000e96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10182 10728 bytes
SHA-256: c5e5988965393355d318239d53875b0e38ab421c54c937cccdcfcf12c43c9ee1