Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1731f13cc9ab77…

MALICIOUS

PDF

91.2 KB Created: 2021-10-09 08:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cbb5a5b02d8e7e29d823fc823f9998b0 SHA-1: 1d7cbda7df80b093939ff371cb5c2e8a3fe53aee SHA-256: 4e1731f13cc9ab77a321ed5d31990c238f01f1b2a8e42af86c3658ded3e74c06
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to a link farm, suggesting an attempt to redirect users to malicious content. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic indicates these links are on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://com123.vn/uploads/file/25511058436.pdf In PDF document text
    • http://www.pattyn360.com/upload/forum/files/durinolafoledijadiluguwe.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/49737161211.pdfIn PDF document text
    • http://onelove.cz/file/fosefukodileduvi.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/49069370307.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/90a31e31cd855eabc9b51e1f0eead6e0.pdfIn PDF document text
    • http://iscelenie.info/files/file/samejolisabuwumulos.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/40325247706.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16154384d7afff.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/rudaxifagokaler.pdfIn PDF document text
    • https://blogsma.com/files/88740371792.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/71738548470.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20211001004533.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/sagirawisuri.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/41044707434.pdfIn PDF document text
    • https://latework.cz/soubory/99285088910.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/popekor.pdfIn PDF document text
    • http://velo.hu/UserFiles/file/616815608.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/mepuwafi.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-25/20210925192007196508.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/nexugixupibovinofesi.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/80687348468.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/firenuketex.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/wakido.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/risotilaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=international+space+station+timePDF 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_off0000fe95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE95 10484 bytes
SHA-256: 0f43bdbee52cbc675ff9652c8cd904e32979b62a4517a6c47a39e7de42a4496d
font_01_sfnt_off00011662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11662 19080 bytes
SHA-256: a1d0ebe74ff7f30de3481b1103e4499c02f55868fc837e03611bc2158c93eda8
font_02_sfnt_off000146f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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