Malicious PDF — malware analysis report

Static analysis result for SHA-256 34044a70a3630c76…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 12:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 96af7400830d225d78ac17597cef6ad5 SHA-1: 75cb93dbaf897aec1b8497f906ecda0d74858add SHA-256: 34044a70a3630c76c81fe8b7da7e528f03886475765c304f4cebbabfc921eee8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of embedded JavaScript suggests it may be used to redirect the user or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://allytemp.ru/uplcv?utm_term=tricep+heads+diagram PDF link annotation
    • http://villacappuccina.com/userfiles/files/susewezodopunutax.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/loropofakuwajojadenesug.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/telififumene.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/wojilanaduzokilamubizofal.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210916065347.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/80203869995.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/gupazavul.pdfIn PDF document text
    • http://szjg.hu/images/file/konaxipifar.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/91920082114.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/getafovepagumimuta.pdfIn PDF document text
    • http://autodilygood.cz/files/file/rafewudawugoriwone.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/61341c310697c.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/1912520344.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/vekaligidoxena.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/fiwedigojubatukakan.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/80298418882.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/menab.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/rosotasipelite.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/sifotefixif.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/zobesupujifaxowugi.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/85169392731.pdfIn PDF document text
    • http://hydrem.ru/images/file/88178496326.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/wazufuwufiladem.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/tisividanolem.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36803153096.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202195_459_225.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_off0000db08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31F 10556 bytes
SHA-256: 5e4d8eea6824de245db3671aecb746c2381d574355dbf0b7b37b202d9ad431eb
font_02_sfnt_off00010af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF1 18016 bytes
SHA-256: f7cf64b079572d4899e9df60802f6b66b4009d717ddd0e0a7e40d1b7c61b2346