Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6fa094b876f1b29…

MALICIOUS

PDF

82.0 KB Created: 2021-09-12 06:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 51844e8cbaf26932079bb6346f070ed0 SHA-1: 103cb79477046aefe4f5d2930f62d774461c5a97 SHA-256: f6fa094b876f1b29a1d4ee463f2bce338fae09629f676dbdf4d8b67dbc89d457
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects to external URLs, as evidenced by the PDF_URI heuristic and the numerous URLs extracted, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gazosilikatnn.ru/uploads/files/15420047083.pdf In PDF document text
    • http://pixel-pro.ru/upload/file/27780024555.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/wifog.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/xepexobivukodojozoj.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/vebumama.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/57070411264.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/53229980600.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/letifunugifadi.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/mikusegumar.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/najaruz.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/tutanijetinapabolinutobe.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/lakolufulazepadiji.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/gomoduw.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109020548498930.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/88756522305.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/ludovexizijowuzi.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/12622758410.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/xavonokejoluzolafonobepuw.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/92776518601.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/nakimikomebolibizalapogi.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/vogutigodatenufokabag.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/79354918508.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/pinadilulofinaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=phrasal+verbs+most+used+pdfPDF 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_off0000dab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB3 10876 bytes
SHA-256: a5a1d5ace82c0061eb9c0d07e7f17e8a16028673415e4044bfa258eeeccf9b19
font_01_sfnt_off0000f3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A8 18208 bytes
SHA-256: 0ffddb3c29070e2b80fc569498aa485c35e02cf3a72a8088009335f28084819b
font_02_sfnt_off00012233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12233 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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