Malicious PDF — malware analysis report

Static analysis result for SHA-256 eea16851c745581c…

MALICIOUS

PDF

70.8 KB Created: 2021-09-21 02:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b4d9827aee649e01375fe7fb1049bd90 SHA-1: 41663bb40f59d59023e5e0620bcd102fc2d2b682 SHA-256: eea16851c745581c13d6047054bacbc84b0a19c6508966ce008d05be16e1da06
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous external URIs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crewmak.ru/uplcv?utm_term=hackear+android+por+bluetooth PDF link annotation
    • http://pm-ural.com/uploads/files/zizoxeb.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/maditudutevudopatutotal.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/munetozorigopibobiva.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/zaguwup.pdfIn PDF document text
    • http://integrotech.pl/zdjecia/file/gidafunewafidupi.pdfIn PDF document text
    • https://lux-ride.com/home/u4-6pzgszajsb5u/www/lux-ride.com/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/42239192203.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/63283567485.pdfIn PDF document text
    • http://beiks.info/public/file/kumexemipudaki.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/tafibijeri.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021091210524771.pdfIn PDF document text
    • https://tonitomov.com/picture/file/wovinatinuselekino.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/fekifavivuf.pdfIn PDF document text
    • https://somogyplusz.hu/files/83866970431.pdfIn PDF document text
    • http://alajuusa.ee/media/contents/file/31249694069.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210905_9CC28E2421550E30.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49895560859.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/96377647616.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1f2c243ed---55497736966.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/38125631061.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/savilekatidabet.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/bumodusajejumedewunaru.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/3137710266.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_off0000b3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AF 10768 bytes
SHA-256: 86427236471ea8e7b538e5603eaa54a7652890be592d5e36b6381333e7b2491a
font_01_sfnt_off0000cc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC09 16228 bytes
SHA-256: 742987351e56217719da51caf05da8bcb96ba5f2207930eca71f523f53b4e6da
font_02_sfnt_off0000f60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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