Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b7849cee14bc96…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 01:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cdb061d0f234b566e29bb303df2da916 SHA-1: 6012e47685abad8b8e44fbf61b7c60e542310677 SHA-256: 77b7849cee14bc9672e2743ef99f9fd0247bec548a8101c3269d06c76ae904bb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to PDF files on potentially disposable hosting, suggesting a link farm or redirection mechanism. The presence of embedded JavaScript indicates an attempt to execute code, likely to facilitate further malicious activity such as downloading additional payloads or redirecting the user to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://asdgolfclubtoscana.com/writable/public/userfiles/file/7092144921.pdf
    • http://kutyasturak.hu/images/files/roparufowikekokip.pdf
    • http://transgusto.ch/userfiles/file/2428510389.pdf
    • https://huuphongplastic.vn/uploads/images/files/52138704991.pdf
    • https://schmitz.cz/res/file/37342929882.pdf
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/5459876885.pdf
    • https://solucionaesp.com/ckfinder/userfiles/files/24318959465.pdf
    • http://avvocatogiuliani.it/userfiles/files/64756449388.pdf
    • http://www.sandipmallick.com/fckimages/file/95572639381.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/c84f53d5ac96f7e102f28f265fba5637/sizogeperiwane.pdf
    • http://zit-tech.com/userfiles/files/guxafaxoj.pdf
    • http://pajurioverslas.lt/ckfinder/userfiles/files/fovujafurazilotijim.pdf
    • http://eternoohydro.com/d/files/wopagevamakosomim.pdf
    • https://namratalakhotia.com/userfiles/files/31772723613.pdf
    • http://chikatere.com/Upload/files/wifadefokogiwofi.pdf
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/90942852634.pdf
    • http://96stone.ru/userfiles/file/43630093906.pdf
    • http://asja.ua/userfiles/file/nezunokudemewamujen.pdf
    • https://jecoexports.com/ckfinder/userfiles/files/97102980468.pdf
    • http://morgancountyoh.com/userimages/nipedufa.pdf
    • http://2sisaccount.com/userfiles/files/silivenasafis.pdf
    • https://its-bulgaria.bg/files/file/bomeduroneb.pdf
    • https://il-gusto.com/images/file/64775466821.pdf
    • http://desiaussies.com/ckeditor/uploads/files/90106958154.pdf
    • https://stormester.no/files/file/28471702299.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+do+i+get+my+phone+app+back+on+my+phone
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d44a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD44A 16792 bytes
font_01_sfnt_off0000ec5c.bin
e2b6a67d2f52ef09c7c299deae30925295884e098f0b5f626e66656b8cb9cad8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5C 18100 bytes
font_02_sfnt_off00011b1d.bin
f0b9d31cef1778d104a9f8de105a345361683cc60a4542f0c34bdaa08b0ed955		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1D 11068 bytes

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