Malicious PDF — malware analysis report

Static analysis result for SHA-256 79bcdeca16a5753e…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 06:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7875b81ac8047b2da50bb503cf77d222 SHA-1: c45809d3ecf711b1651e5a8c650ea4cfb08a1bd5 SHA-256: 79bcdeca16a5753edc45b5e2a517332563e24717ff885618c704b05aeb4d9bd7
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external links, many of which point to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to download further payloads. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://visualmotion.nl/uploads/file/92285118731.pdf In PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/72292416578.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/bemelotinejis.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210912203626.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/53200524474.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/nomulifabunajatuzorolide.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021972151474816.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/ruxuxofutotamozuketazix.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/kagofamaduto.pdfIn PDF document text
    • http://ihdbd.org/upload/files/bomaruzigabutifolitesora.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/gazobetumumagejorosisapi.pdfIn PDF document text
    • http://armanetti.com/images/92783939207.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/91595101024.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/30561173304.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/poxuve.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/92531051935.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f19051864d---32564438910.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bb41314b5---rigawofetijerokuzar.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/74082219449.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/bomekinirad.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/zawizotifugejopewa.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/dugivomibiteronupiv.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/60466350424.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/23827668835.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/tusewi.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091004360273499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=water+in+ear+dizzyPDF 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_off0000df8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8B 10076 bytes
SHA-256: 6b1b7d72894823e9e5343430e8b26c04117090c8f4ad7838039ffea17ece0d9a
font_01_sfnt_off0000f619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF619 17868 bytes
SHA-256: f83d9329c016bd70d790513bb72d919bb4a9458e8bf55cfa9bcb5081fb94ad4f
font_02_sfnt_off00012460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1