Malicious PDF — malware analysis report

Static analysis result for SHA-256 49bb713bce104a71…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 12:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 94d70c22a6345e799a7f0729ce0f5e5b SHA-1: 62a36a26668839f49b2aec18190da68578134c24 SHA-256: 49bb713bce104a71249ece486662157eefa730f85f16dc93a3b93f9fd4bfa235
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are configured to serve PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed for SEO manipulation or to host malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. While no scripts were explicitly extracted, the nature of the embedded URLs and the link farm heuristic indicate a potential for malicious content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://leise.ru/admin/ckfinder/userfiles/files/kuviteguru.pdf In PDF document text
    • http://ssss-sangam.com/userfiles/file/25115869466.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/xepen.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/xogowuvaliluzemukoma.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/mokewagavegat.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/pulogotabijofivuvun.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391bcfb6f04---31239576628.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/labawisalumok.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/luwivekazeleda.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zirenexiwowivurukolulol.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/79299313212.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210910_59F251F7B96A25AF.pdfIn PDF document text
    • https://petala.gr/userfiles/file/21420520926.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/38931849376.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/gupelazidokagur.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a6ea58828c5dd3dd1d4c5878df7336e6/koruwazakegiki.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/lazewibitusupemo.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/25240329389.pdfIn PDF document text
    • https://kimcert.com/E/file/41585100230.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/90599952162.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/vosimebitasizebubegozuj.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/86904646552.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/56257109780.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/woroxidekesogagunigarib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+do+i+get+weather+warnings+on+my+phonePDF 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_off0000db80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF397 10984 bytes
SHA-256: 26501e9fde0ea83c96a18d5564adc87e0bf945ed1f05a3f3b0347324bc2388b5
font_02_sfnt_off00010cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBC 16532 bytes
SHA-256: bcb8bc4b078e479f6feead7250008c215b241a8c7615116d1645fd6c250fd13a