Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f974ce048966bc…

MALICIOUS

PDF

76.4 KB Created: 2021-10-08 02:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 15a7b537ae5e748c7f0e023e59962358 SHA-1: 0c042f85c0828c4cf09d4552a1b7bfcbc5409a4f SHA-256: 56f974ce048966bca7225f51112a85e54a3936adf8d35b9b0eaefed2b8788fd4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://doradcyprawni.com/images/pliki/79423594031.pdf In PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/jaromukufidegatunuz.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/86602267147.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614625e68df26---xosawipir.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/66094303431.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/6384215985.pdfIn PDF document text
    • http://byecook.com/ckupload/files/pujimawunatani.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/bokegimowumejo.pdfIn PDF document text
    • http://patroha.hu/file/92119299419.pdfIn PDF document text
    • https://jin-ji.com/upload/files/nutusufo.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/22560966958.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/xereremukoduti.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/43628545582.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/13619931243.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/pibogufojus.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd4d8e27c6---33558491317.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/82973295672.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/tepomofekejagu.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20211001002001.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/41177786337.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/2139899965.pdfIn PDF document text
    • http://4bx.pl/public/file/kevesizifiwamiluxira.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/xusugalozanakopewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=multiplying+and+dividing+fractions+practicePDF 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_off0000c38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38A 11068 bytes
SHA-256: 63d6eaf0ea6c899ddb40a8fb0dc8efa41a002cbc28cd4b4e2825d8abcae0d807
font_01_sfnt_off0000dd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD49 17916 bytes
SHA-256: 01405a9bbd45872884f486c8bcf524f64a5a4ec6e7e139ffd5e6905c8d574413
font_02_sfnt_off00010bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1