Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40b0b772546ff19…

MALICIOUS

PDF

70.7 KB Created: 2021-10-03 06:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8723d3158cb21ca3d43c57bc1505dde9 SHA-1: f0c8871ba51bf27930baaaa9047de899d9709998 SHA-256: b40b0b772546ff1916051ee7ebb1cdb3fd26ec8d8fa020a93610621383d6cc08
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or redirection mechanism to phishing or malware sites. The PDF structure and embedded content are consistent with attempts to lure users to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crewmak.ru/uplcv?utm_term=reagan%27s+primary+role+in+ending+the+cold+war+was+to PDF link annotation
    • https://ijp2.com/contents/files/43371323528.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210920225922359.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/xemopisubas.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/zamogukadavuzuwexutobomem.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/notevuja.pdfIn PDF document text
    • http://co-mit.com/uploads/files/poxixixowisarodi.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/vogonibama.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/95177552617.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210903023320.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/tefomarigaradufaxadilim.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/58386550906.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/28eef713956d1e33dd04ef6047a3ea4e/22460061245.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/sopej.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/6718327218.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff0ddb2b0d---naresumokuzofebof.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/susarufaguvenivisonexojab.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/duvikok.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/fobunulimu.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/jibusaropo.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/68628165663.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/mabubumidozuguvorewave.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/mijulugitome.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/rupoxidudawi.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/38294502888.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/4969410075.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_off0000b0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FB 11240 bytes
SHA-256: 0c0cb550acf521e9741c00f859055c7060edfa2407163bee8fc8f54c48a30c54
font_01_sfnt_off0000cb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0A 16480 bytes
SHA-256: 34dead20bff12bf3606de9fccaac58f9cd2af36560af069eff2d7bbbfcb3cc02
font_02_sfnt_off0000f485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF485 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1