Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c18dcb9221afa13…

MALICIOUS

PDF

82.9 KB Created: 2021-09-14 13:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a82bb990196f8b66a973d09f00c69fca SHA-1: 3a8e1a24500a31e468eb37893249b0da6dc80c78 SHA-256: 2c18dcb9221afa132be07fdcc022f04506a5af65721a5625bd9cae4e7fa66267
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alnoorcity.com/userfiles/file/86585889362.pdf
    • https://www.abandassociates.com/ckfinder/userfiles/files/kofepejosufevibam.pdf
    • http://henanshuangxin.com/d/files/powidasefinef.pdf
    • https://tdfstore.it/file/83502739849.pdf
    • http://paulgraphics.paulsfashion.in/files/nosubol.pdf
    • http://sieuthimaynhapkhau.com/upload/files/danabu.pdf
    • https://partroyfuneralhome.com/partroy/assets/file/55082032466.pdf
    • http://capesociety.ca/uploads/files/62343492616.pdf
    • https://akanaymatbaa.com/calisma2/files/uploads/fizojuxigaridadew.pdf
    • http://protectakoteasia.com/ckfinder/userfiles/files/7277967167.pdf
    • https://jokerprod.net/userfiles/file/40673449660.pdf
    • https://digireg.dk/upload/tiwuwofexatuf.pdf
    • https://pro-biomed.com/admin/userfiles/file/nedoxuwegugixerum.pdf
    • http://gammatradings.com/userfiles/file/80289448903.pdf
    • http://harryreichert.de/uploaded_pics/News/file/38096174492.pdf
    • http://apexnepaltravel.com/userfiles/file/3740276131.pdf
    • http://saothienemb.com/uploads/images/files/14378613164.pdf
    • https://manhremhoangvan.vn/wp-content/uploads/files/93683328678.pdf
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/lawulumibakunexarag.pdf
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/6852936673.pdf
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/lutafozifilameferomeku.pdf
    • http://camdohungdung.com/upload/files/91329115289.pdf
    • https://cabsfromheathrow.com/userfiles/file/suxetawowagutatili.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=hill+climb+racing+android+2.3
    • 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_off0000da1e.bin
e085ae215a65772fcf5881a7fc734250a879f84aa77513d5e80a189972b78b35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1E 19520 bytes
font_01_sfnt_off00010d5f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5F 16792 bytes
font_02_sfnt_off00012576.bin
1d014ecb767532eb20180ba0afa79932eccdef399c7210bdee710f1ec4acc450		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12576 10804 bytes

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