Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc02075a8bafa3a…

MALICIOUS

PDF

78.2 KB Created: 2021-09-08 12:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 28206dd2a222c61005a1b3506a33e2a4 SHA-1: be2d3b3675d8d9961032eac7bfab3649d60c3771 SHA-256: afc02075a8bafa3a0e3dbc9526d9b672a957271e2c2a5ba432a8a9569b9c1f4f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://pistant.ru/uplcv?utm_term=orden+ciconiiformes+pdf PDF link annotation
    • http://www.dr.schure.net/ckfinder/userfiles/files/pixupikixulolezajezes.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/41379573061379dac46571.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/nitilobada.pdfIn PDF document text
    • http://www.toptehnik.si/images/joleru.pdfIn PDF document text
    • http://hkwwta.org/userfiles/kumejowibapajozadobexaw.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/99596518194.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/sitipukivitamuvezabuna.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa3200610---valotokakukepabej.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/11111561925.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/pujaliw.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/kuniwutilu.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/melawoputatikedexexa.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210907025103.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/20262451931.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/xazevedo.pdfIn PDF document text
    • https://ghnservizi.com/file/60485228416.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/23743695733.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/71000878114.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/zawarigafoganuluvopor.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/10131926226.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/a8abcaa969a067d440956b675f033a77/tewujul.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/zowunevesokejagibotimoli.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/bopadowitamutumuxub.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210901115343.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/62863334538.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_off0000c59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59D 20460 bytes
SHA-256: a4abb4797ff96b63e488d1ccb419db69b572c672dc0834d30bd76af5bf0dacba
font_01_sfnt_off0000f9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D7 10500 bytes
SHA-256: f690face9404cda1537e4a7ef75abdfce0ec1f4543c5c558e59d078596793e08

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