Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b6a3f81bdb10a4…

MALICIOUS

PDF

76.1 KB Created: 2021-09-16 11:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 62721e32db96b005156891137e5294c5 SHA-1: d82bbc61135a64e58d6ad9769470ba3b20f333e0 SHA-256: a6b6a3f81bdb10a4b4be073f442bb74165d36ccd335ffbdc75baddc22f28503b
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 disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malicious content. No specific family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://ohmamakitchen.com/uploads/files/ginirezutata.pdf In PDF document text
    • http://teamtrinity.net/trinitya/file/rorixepe.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/5104665300.pdfIn PDF document text
    • http://precisao.net/files/files/geluxitum.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/duzolo.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/99041983203.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/41149872649.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/85874182780.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/kesogapasunadag.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/golalosiso.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/purifilobuvad.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/d9k66bjv1575tsfihrsjqaetis/siseki.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/poputudegibilesexi.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f015b0b3ac---vuviwegewebubemabiwur.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/rakapogin.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/82830833551.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/060625039058.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/zejotarogudarowolesak.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/34903867798.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/86904539998.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/76199272313.pdfIn PDF document text
    • http://sbairs.com/datas/files/naxijokotan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=download+zombie+tsunamiPDF 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_off0000c505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC505 17444 bytes
SHA-256: 874dfae7c7651fe414c8cff0a0ae4cdcdbe1d6024cf271e0f117f34556dee9ab
font_01_sfnt_off0000f28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA2 10696 bytes
SHA-256: 295582175a17d8b507ef0a403992487bef0e62a592e1247fbef59761700a2e30

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