Malicious PDF — malware analysis report

Static analysis result for SHA-256 31698cc751d34c18…

MALICIOUS

PDF

86.9 KB Created: 2021-09-15 13:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c244f419687ef256b40937942777aeb3 SHA-1: 4d3d2d8945e8961967b15cfaa6a0d1a1b3871d66 SHA-256: 31698cc751d34c1809d982bcb003740b427a74da4e7bf9e758bb48c2661360b0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards the T1566.001 (Spearphishing Attachment) technique, likely leading to further malicious content or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • 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.
  • 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://archism.ru/uplcv?utm_term=rlcraft+in+android PDF link annotation
    • http://chetaomaynganhnhua.com/uploads/files/88787946086.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a7b6c0cca---zolelixakonirasa.pdfIn PDF document text
    • http://merwepizza.com/upload/file/99683070868.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/91313061754.pdfIn PDF document text
    • http://surestegc.org/documentos/file/79897342564.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/6134a7c3c401a.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/88032483484.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/pofiguvamimafatolenarej.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/rapavugofivimufibajomuli.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/wojuxisevadufepidede.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/va3lepduurosekot1ese4g3t45/67372992406.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/30593550866.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/77169276188.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/70977165322.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/kiteperekituviraloxetak.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/26996977836.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/86863172540.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/domosisizumubebati.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/4261915135.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/53826514557.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/zazudosewalujolerasepixiv.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/90325783768.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/34148216087.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/bevotodolapokimuwosafor.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/megalejorazilixixixoruwa.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/71115458524.pdfIn PDF document text
    • 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_off0000ef84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10796 18168 bytes
SHA-256: 925fcfc4364e26d12de98425c21657bdf5be7155d80b9e3796816f9b730097ed
font_02_sfnt_off0001371d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1371D 10212 bytes
SHA-256: 624eaae63aaa58571ec76ca97335954173354aad0db7fad4920add375b9cc5c8