Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f7f0e2bec89867…

MALICIOUS

PDF

74.0 KB Created: 2021-10-02 20:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 1bef02f39876eda35621535b0088a1b1 SHA-1: e229ad3e2cbb85e8ee9dd665414b0c4e4eb638c1 SHA-256: f5f7f0e2bec898676aea8309aaa5267e32b9f4b70744c29007c295f549cbfe2d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to unknown domains, suggesting a link farm or redirection mechanism. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the conclusion that this document is designed to lead users to external, potentially malicious sites.

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://intertribo.sk/files/77266983712.pdf In PDF document text
    • http://chataphan.com/file_media/file_image/file/jisalabepomotezitat.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-4/20210904031718258208.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/13243388954.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/fizutikaneguvawonalu.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/90162663051.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109051254594853.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/tekudulasowi.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/lujopuk.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/bogikonugefesuxatexonu.pdfIn PDF document text
    • https://songhongresort.com/img/files/12025870885.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/reserajixebovopem.pdfIn PDF document text
    • https://amgaa.org/temp/files/38192273288.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/wafep.pdfIn PDF document text
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/67509050520.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/fabirejove.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/f91ce3de00233992d53366c09b22cbff/povomanimafi.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/89980776524.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/22962641154.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/b2cc62060576db835e8ee9b350f89cd2/12860049824.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/50433104164.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/dibadaf.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/bopugiwopuxujomupu.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/puzememunerezemow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=andes+mountain+rangePDF 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_off0000bb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB62 10624 bytes
SHA-256: 7292c5bd20869301730965d145ad7bd30fc2f9b99c4570b6a3f958eabbea91b3
font_01_sfnt_off0000d37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37C 18504 bytes
SHA-256: 21e6c93d37bd7e8901c1cf6a926fa8b2bfc32d1726d5878f52489f117417faaf
font_02_sfnt_off000102c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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