Malicious PDF — malware analysis report

Static analysis result for SHA-256 3287d24a95c6bf2d…

MALICIOUS

PDF

70.1 KB Created: 2021-09-21 06:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32b32a05057f2acdc889a9a59fdc20d5 SHA-1: aaa32c48fd5c22ae10ec8485a86516c8abcfbe3d SHA-256: 3287d24a95c6bf2dd90036e8ea5ee7a4ad6b59df10e006826398be588ef8c83d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript and numerous external URIs, flagged by ML and ClamAV as malicious. The heuristics indicate it functions as a link farm on disposable hosting, directing users to a large number of other PDF documents. The embedded JavaScript likely facilitates the redirection or exploitation, contributing to the overall phishing and malware distribution goal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 https://queure.ru/uplcv?utm_term=8+ball+pool+multiplayer+hack+v3+5
    • http://unicaconsultoriarh.com/images/files/33469795607.pdf
    • https://mysilo.com/upload/ckfinder/files/53136075223.pdf
    • http://pbhdom.eu/userfiles/file/10011149253.pdf
    • http://datavincity.com/uploads/ckfinder/files/18908795054.pdf
    • http://thucphamchucnangmy.vn/uploads/files/3739026409.pdf
    • http://nofatrans-int.com/userfiles/file/powazu.pdf
    • https://mimpiindah88.com/contents/files/razosep.pdf
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/83956608142.pdf
    • https://holocaustresearch.pl/nowy/photo/file/72667359840.pdf
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/xokutep.pdf
    • http://bfttacg.marketsearching.com/upload/files/nososenetusodokasajowume.pdf
    • http://gotoippc.com/ckfinder/userfiles/files/pigofituwa.pdf
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/rapuwiwelifalazesi.pdf
    • https://congchunghadong.com/uploads/files/33968943953.pdf
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/putopo.pdf
    • http://www.jacenter.org/js/ckfinder/userfiles/files/19713301022.pdf
    • http://www.hgekc.com/media/userfiles/file/21008829421.pdf
    • https://beautydiction.com/ckfinder/userfiles/files/xagufuf.pdf
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/2904533250.pdf
    • https://livewireeventz.com/userfiles/file/jotofokuzeroletide.pdf
    • http://climacom.eu/userfiles/files/17339320003.pdf
    • http://lecostationery.com/files/file/jovusagugibofubebaxeki.pdf
    • http://vit-physio.de/file/68725624605.pdf
    • http://slovbau.sk/test/userfiles/file/zulixoputepitaresatadu.pdf
    • https://kibledergisi.net/resimler/files/bowiti.pdf
    • http://polipack.ru/content/file/14304790205.pdf
    • https://asmitahrgroup.com/ckfinder/userfiles/files/pexolemigo.pdf
    • 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_off0000b33f.bin
e373574218226164205d285a20e925ae220a67d7aa955e4c7aca3aa76f9f629a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB33F 11296 bytes
font_01_sfnt_off0000cda3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA3 16792 bytes
font_02_sfnt_off0000e5b5.bin
0fffe0ddc2bd00c919321da7d434739244deb0a877722d4449c128889e5e4d03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B5 14596 bytes

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