Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9626d3aa3e2099…

MALICIOUS

PDF

76.2 KB Created: 2021-10-11 02:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a688996711b84ce002e1795a2e4327e5 SHA-1: ba7e7e1e49ddc9015042d8a0727106daa32826ba SHA-256: 4a9626d3aa3e20999c2448233c31d61b658a5e2ed7099b8d3a956eeedac0f486
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are structured as link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself, along with the presence of external URIs, points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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=once+started+a+unit+of+blood+must+be+transfused+within PDF link annotation
    • http://registermycompany.in/admin/userfiles/file/dufivipewugetuvedeguxa.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/xubujowobudokurodujawipoj.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/lubekiforovodinovazise.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/58119609241.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/garafurudatuviwofubi.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/39102955322.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/4270171185.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/93921448018.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/10089546329.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/33619583125.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/tewuselexunuba.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/27832913567.pdfIn PDF document text
    • http://dobosugyvedkecskemet.hu/userfiles/file/26327186343.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c8eed33c2b---maruvaj.pdfIn PDF document text
    • http://xhslsh.gdx.cn/ckfinder/userfiles/files/fuduvubixuzajetokadutaxif.pdfIn PDF document text
    • https://iohrp.org/f_files/files/zexovotefare.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/xujoxukexuwa.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/19965232807.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/xiwuver.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/17265076506.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gitanozomajel.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/kebekujopibuxuxelukuzaba.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_off0000c6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F2 16336 bytes
SHA-256: 3536f34a378b7e9d11f9d551a670eb2c96ee29742b573143e2de76bd0cd9432b
font_01_sfnt_off0000f0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10901 11092 bytes
SHA-256: e187b1cdecaa85704a3f1249652b373e629f696539b5ece6ff4b5e6b085e2556

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