Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a608f474b9e13a…

MALICIOUS

PDF

68.8 KB Created: 2021-10-01 04:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 734b4100dd8aa013fe4effeff45c5c3b SHA-1: 0d639d650d200c3b1ca4e3ed764b93ad182512b6 SHA-256: b1a608f474b9e13a42948cd19e342288320d5b793aa2ecf0c0a87dcae680202a
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including a small file size and an image-only presentation suggesting a screenshot. It contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://tokyoto.pl/UserFiles/file/xofuvopevuri.pdf In PDF document text
    • http://erictex.com/ufiles/files/21671035743.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/rakawukifanawuwigetozax.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/nufed.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/89318147010.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/82790608686.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/26416565358.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/gumeralab.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/82390762276.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/78st1p42i4r6cj33np9u8i01hh/21197038229.pdfIn PDF document text
    • http://netart.hu/userfiles/file/29160431405.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/6880a1eb846dba4cd56eea1ebe1646bd/89769046518.pdfIn PDF document text
    • http://artepcb.com/upload/files/zowajujapevebe.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/mosofogilu.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/3249326152.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/gozemivimuwokov.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/8881019263.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/ninutudub.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210902211650.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/bewowoludiw.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/xijejarexaza.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/vijajukagumiw.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/78099310630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=pride+and+prejudice+movie+watch+onlinePDF 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_off0000b09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09B 10996 bytes
SHA-256: 7663fb6b49f1a37411404bf8e57972e95ec21803aa883c4e18bb6c79ebd26ca6
font_01_sfnt_off0000c9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E0 14304 bytes
SHA-256: 8c7fd9bddcd3b1b0353087abada54a3dd9665bf1e13e98ab61d6a19598460f8f
font_02_sfnt_off0000ed43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1