Malicious PDF — malware analysis report

Static analysis result for SHA-256 9444b7ab8caa8a3a…

MALICIOUS

PDF

80.5 KB Created: 2021-09-20 19:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 269d6fd263383b1172825401ee1e9c6f SHA-1: 311a89cfdf60dfe0378c448643c6f4fc6b20d55b SHA-256: 9444b7ab8caa8a3a42602a5e6ac00bc209079c13dbc4932deec86b8d8dc2c6c3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains embedded JavaScript, which is commonly used to redirect users to malicious websites. The PDF also exhibits characteristics of a link farm, with numerous external URIs pointing to disposable hosting, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://oniceh.ru/uplcv?utm_term=peeta%27s+painting+of+rue PDF link annotation
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/37811612494.pdfIn PDF document text
    • http://pi-consulting.ch/download/18804369765.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/80634733075.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/fobalitekuxogidodozot.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/poguxuzanuvosuzagak.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/60592066417.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/70841501282.pdfIn PDF document text
    • http://ministerium.pt/files/9260133432.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/lagogesukorirozopamijo.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f471402ec7---1235573428.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/80781827706.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-18/20210918212656506531.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-7/20210907024401593242.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/puwenavarovuxasuxexem.pdfIn PDF document text
    • http://minerva-collection.net/files/files/fipuvojux.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec590a7b00---49121369661.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/32804119384.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/9106066219.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/55999544648.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/1365786167.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/89670347911.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/vufosesed.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/47862861516.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/vemiwejenevipojokata.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_off0000d6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CD 10624 bytes
SHA-256: 37f70ebf3109e211aef45b88b32fb9bfc95f107b875b7e474bd64409f0687622
font_01_sfnt_off0000ef4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4B 17680 bytes
SHA-256: b898fd4130c10054153add851c5f2b59c05a13cfac3bb548393157a171bb34ad
font_02_sfnt_off00011c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1