Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a6a257e52da250…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 15:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 96c90691a9284f871add0285220c88e0 SHA-1: 580bdc56bbe9523f728f9d64784135524249fb90 SHA-256: e3a6a257e52da250ebd55f0900dd59185cddf9c17458abd254160832f64f0ca0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to unknown or potentially malicious domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggests a malicious intent to host or redirect to harmful content. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://kakakmanis.com/contents/files/venorupowijovufoxalef.pdf In PDF document text
    • http://greenflameenergy.com/userfiles/file/5737338375.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/ninixudejovavafegel.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/belitikaxikukekiv.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/pelikos.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/nuzedigisuxodonuwokul.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/kufojekumufedimok.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/92315955494.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/43318791909.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/b0cde458aad07a127cdaf59120dc450f/87172755749.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/pidez.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090402000573499.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/wubozubutujixivixobe.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/kavanufuxoxisagofod.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/54049936847.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/97095627340.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/83203539144.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/fubogivore.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16140e8d8b320b---3328200876.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/lakinigi.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/lumanolevuruxepu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=tutu+spotify%2B%2B+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAECD 10488 bytes
SHA-256: 6b55ef5e2297a05f08fd1c51a3f538aa08418d821bbc639753817334e3b4d3f8
font_01_sfnt_off0000c6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C8 16284 bytes
SHA-256: 54df4c4708671434e21e13886a8e35bf5b3f90f6be4bef5a751fad76b1a60bd2
font_02_sfnt_off0000f021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF021 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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