Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b7fa912c305733…

MALICIOUS

PDF

81.9 KB Created: 2021-10-04 12:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 001b39465e17d1a1545db82efc294871 SHA-1: 635324c31a81f413f663c16147b8bd04e8fd9281 SHA-256: 71b7fa912c3057332905a4c732929b5da192b39368283c46aabd91a0c2e5915c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=checking+dryer+heating+element PDF link annotation
    • https://kuzeyilac.com/resimler/files/69473118215.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/nipexobijirubepefotu.pdfIn PDF document text
    • http://lscapital.it/images/file/26582712562.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202110032253417261.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/59888267055.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/2352478029.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/84456262426.pdfIn PDF document text
    • https://tmtteks.com/files/gevififagawuponejemun.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/genidam.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/vugonelijupitit.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/24342894792.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/woxesifumufowuxikogajawel.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/19739874172.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/70947583460.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/xikakokopewibete.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f40340aa6f---wuvopunebulenuk.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/fadevusorusum.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/68802785000.pdfIn PDF document text
    • http://centronegozi.com/public/73649991419.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/44753436099.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16140375c04070---24658463523.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/94337985489.pdfIn PDF document text
    • http://becucci.it/userfiles/files/82148092170.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/14899390851.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109072315173802.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_off0000ddc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC0 17116 bytes
SHA-256: d3c041fc97abbc1047caf736333dfe0b328169bad91f8959ba3a19b636e1d1b7
font_01_sfnt_off00010993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10993 10764 bytes
SHA-256: 95e60e5826303a921fb59acdb443979b1a95ac6be0f2c95c05c444af3937ef46
font_02_sfnt_off000121f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.