Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d4142e9ac2bdc3…

MALICIOUS

PDF

71.9 KB Created: 2021-09-17 00:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 358b2f3deb4a3064044c0c0dada00e43 SHA-1: 54a582901d9da1ab99e6d02cd767ec9ab9743096 SHA-256: c4d4142e9ac2bdc32b8ca3a76c5caed95cb9179c972288b7bc2ae28681b1672d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm or redirection strategy. The PDF structure and embedded URLs suggest an attempt to direct users to malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=nfs+most+wanted+2005+game+download+for+android PDF link annotation
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/66902095973.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/40889659762.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210904_7E0A6A72C114E9A6.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/ralodasokiselevosip.pdfIn PDF document text
    • http://centrons.com/uploaded/file/5754961586143b0762a88e.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/gikodirolale.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/kelineganazuzigenolis.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/82731567626.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/kizebew.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/toxetarogovodolevo.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/wonikikavafuleg.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/4935096444.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/gexiton.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/fufifoxenoku.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/60376077851.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/walokate.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/jepumuwawafexesak.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/fifumavuladi.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/pixufosifupilabetejab.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/giwowujiko.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/gifezimeverodoximon.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/77260351427.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/79084992415.pdfIn PDF document text
    • http://slsnn.ru/content/file/mogejavos.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161358ce786404---bijokofit.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_off0000b883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB883 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD095 15296 bytes
SHA-256: 8c80d1a0a9c3371b2b81726103d32a33dd5ddab6cb33aa1909b6484415ce8761
font_02_sfnt_off0000f764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF764 11136 bytes
SHA-256: 5b1c67a9accd510433e20b5c5264795ac591c46400ea332a78064ebfbf3ee4b5