Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b069c65fb65c2e…

MALICIOUS

PDF

73.3 KB Created: 2021-09-24 00:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ebc7dc85682f4375bb92f23b7212dd3 SHA-1: 6fee17ece82083f6bfdb37e8d52eb3a613950430 SHA-256: 71b069c65fb65c2e80b266b9cd1a018a0ee6612cfaf6ba5a5bfe9bf947388ac8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to one of the numerous external URLs found in the document, which are often used for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://doan295doson.vn/namthuan/images/news/files/59071900234.pdf
    • http://aburobocon2019.mnb.mn/uploads/files/jofusemunimilobitojalo.pdf
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/zoxepameluronavovasofix.pdf
    • http://shopabrang.com/images/files/medidepevijivoretukik.pdf
    • https://n-vv.dk/userfiles/file/dubapuzakifosefizozumi.pdf
    • https://jkmart.net/FCKFiles/File/xuguvepagaxeneragexuxo.pdf
    • https://sharedsynergy.com/userfiles/file/64931613445.pdf
    • https://aawyx.com/sites/default/imageuser/file/80242362801.pdf
    • http://trevelci.ru/ckfinder/userfiles/files/vexogaxokixez.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614b05d3a1d8e---79906117456.pdf
    • http://tai-group.com/upload/files/34465330651.pdf
    • https://edex.co/userfiles/files/45686451244.pdf
    • https://ismart99.net/upload/files/vopadezalafufanomomesi.pdf
    • http://efuturesthai.com/uploads/file/24009382903.pdf
    • http://agcslohian.com/userfiles/file/guxuvalif.pdf
    • https://seltec.io/images/uploads/files/68578924158.pdf
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/kajujunotetewewemadan.pdf
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/mukosekavulanulenizobilog.pdf
    • https://f27szerviz.hu/upload/files/49710471632.pdf
    • http://liluby.com/upload/file/pujuxujajerajifus.pdf
    • http://mijn-nederland.nl/userfiles/file/kesigezon.pdf
    • https://kalimati.in/userfiles/file/78119107517.pdf
    • https://poolpoint.be/uploads/file/87383284499.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=read+sherlock+holmes+online+free+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_off0000babc.bin
43c94b9269c2e1cb7f12fe54407561ef1aab9287f94880b26ed2f92ed7ef6617		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBABC 10924 bytes
font_01_sfnt_off0000d3cb.bin
6894ee32f102199cd95d546448d30440ab40abf51b6373760c32b684bc701906		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CB 16748 bytes
font_02_sfnt_off0000ff59.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF59 16792 bytes

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