Malicious PDF — malware analysis report

Static analysis result for SHA-256 3419ab80ed284e11…

MALICIOUS

PDF

76.6 KB Created: 2021-09-15 13:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a002efe00bdac38722e6ee6fb98cf6a7 SHA-1: 3b285513e63697aacff1c83dbfc857ad56dae9f6 SHA-256: 3419ab80ed284e11c305efa9ad4b4f59f7b3cc2186c43088242d132f154676f8
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, with one heuristic identifying it as a link farm on disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of many external links suggests a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=classic+games+unblocked PDF link annotation
    • http://shouce-image.kuchuancdn.com/Public/resource/files/wopafog.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/kuzuwiv.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/80231210968.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210910090454.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/vujexakudetugimuwuz.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/jemetoxase.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210913_174A045946807797.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/xevijerunumitijo.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/69972582364.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/mugufofejekoga.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c36f5588cd---56434916378.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/siganipazetonujebu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f94c0c25e8---nasogiravexulo.pdfIn PDF document text
    • http://telektrans.hu/editor_up/zutogozezebonelabum.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/76595967421.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/fukunidojekebe.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/sadofovomupexikojalexevom.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/ratelokenupiduteb.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/91911192962.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210911171305.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/9907730002.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/9167072268.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/66347845043.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_off0000c77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77E 17168 bytes
SHA-256: f2bea76a73271e17d70b18fd2d8e0480a395f718c9fd01f5f9db02a43ae88043
font_01_sfnt_off0000f3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD6 10876 bytes
SHA-256: 7c68d27c028137827ef05e68631d7799d7d024339179b492d90d84d672e50d00