Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4068ea873fecfce…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 16:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a501d1f4ca19e1639b31b1d25ea76303 SHA-1: 7e60e0af0697db02eb6e955159a3773c4039a840 SHA-256: e4068ea873fecfce2b569b5ad69cba5e969b97e92124cb1854b87e948823cd93
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with critical heuristic firings indicating it is a phishing trojan. The presence of embedded JavaScript and a large number of external URIs, many pointing to potentially disposable domains, strongly suggests a malicious intent to redirect users or download additional payloads. The document body was unreadable, but the heuristics and URLs are sufficient to infer a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://juhaszautovill.hu/userfiles/file/61474948090.pdf In PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/fewumugetebibano.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/95642318465.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd59392997---68063985902.pdfIn PDF document text
    • https://iwistw.com/upload/files/99307413058.pdfIn PDF document text
    • http://huefpdf.org/upload/file/roxoferafapuxefofop.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/davibasadikoki.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/nujuf.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/8576025902.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/40523726826.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/bipugavopatu.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/78068107300.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/59840015478.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/zexekarisutatezokodotixob.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/49846349415.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210913_58089CB97939EBFA.pdfIn PDF document text
    • http://venkateshservices.com/uploads/pijeg.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/fodejowutegojosof.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/57758582785.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/pusutovuxozokudadil.pdfIn PDF document text
    • http://laduses.nl/image/file/vilibuzapowaleli.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/todaviwibatejoxen.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/8888237141.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-10/20210910040447945086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=chaar+sahibzaade+2+full+movie+online+123moviesPDF 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_off0000d7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C9 18368 bytes
SHA-256: 1e2be7cd4c0ee5015c8816a9e547b7d272969073ad4221ccc2fdc98c77ade5ee
font_01_sfnt_off00010840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10840 11264 bytes
SHA-256: ab0f4f155be9dbe1911cc9703cf0e437f5bf8281da4c3b4a10e07c8647462715
font_02_sfnt_off000122a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1