Malicious PDF — malware analysis report

Static analysis result for SHA-256 3abd54b843305549…

MALICIOUS

PDF

82.2 KB Created: 2021-09-08 22:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82bb5358c0eeb73f9ed7f998788c726f SHA-1: 5c51fe98a5a75f8266859f936c567e64b523a7a4 SHA-256: 3abd54b8433055491af8dbd9bf41976223a944bceba90cf46c182497b8fa2373
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ytbozhuo.com/upload/file/052352054650.pdf
    • https://giasidaily.com/uploads/userfiles/file/kovawevu.pdf
    • http://sportingclubalbinia.eu/userfiles/files/tovumefugobinatupatuw.pdf
    • http://gjbbang.com/userData/board/file/75425057103.pdf
    • https://hondamienbac.vn/userfiles/file/zatazex.pdf
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/2341644317.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613661be0beb2---42208754144.pdf
    • https://whatshoulditcostme.com/userfiles/file/97154851104.pdf
    • http://dailygameresult.com/editor/UserFiles2/files/vesukobinojibewutipofa.pdf
    • http://uralcomservis.ru/crn_fls/crn_files/repanakudoxepevi.pdf
    • https://almentispharma.com/ckfinder/userfiles/files/fikisu.pdf
    • https://hashtag.school/userfiles/file/24584711433.pdf
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/nebodalosotizogoseludu.pdf
    • https://efnnma.org/files/file/66638059846.pdf
    • http://studionegro.net/userfiles/files/97120027219.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/1250481qo0le5eeqb1a7cb17k2/welitogobalagixofevu.pdf
    • http://soleilboo.com/images/uploads/files/91827290898.pdf
    • http://antropolog.ru/userfiles/file/58898042780.pdf
    • http://klwas.org/userfiles/images/file/81859838494.pdf
    • https://chachachat.info/js/ckfinder/userfiles/files/1847359664.pdf
    • http://nocleginaplus.pl/uploads/userfiles/files/wimawit.pdf
    • https://coonvalleycc.com/userfiles/file/42058609094.pdf
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/16734321736.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=thor+ragnarok+123movies
    • 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_off0000d538.bin
2eaa010b417684cbfdbe5b7914b6f26d9118e5d14116e9d5f456ea13015d6030		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD538 20360 bytes
font_01_sfnt_off00010aa1.bin
1d003fad0b689c9531dc79affdd078abc9e34b7c27798560f32d08dd1bb589f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA1 10876 bytes
font_02_sfnt_off000123be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123BE 16792 bytes

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