Malicious PDF — malware analysis report

Static analysis result for SHA-256 e141ecaf295ed00f…

MALICIOUS

PDF

70.3 KB Created: 2021-09-27 12:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 06da328db83e2b361b6ac55200269e31 SHA-1: 79d2c91fa984bc1fa37a90f4a50e31345276bd04 SHA-256: e141ecaf295ed00f6b90532821ba1e11ed9f63492ca2290969b59e06423dc8cb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code or redirect users. The presence of numerous external URIs, many pointing to PDF files on different domains, strongly suggests a link farm or SEO poisoning attack. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing or malware distribution vector.

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://equinox-e.com/upload/files/zidasurufogozudono.pdf In PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/tatozu.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/gidibobozigum.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/lijitotetenitor.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/79153693664.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/4692081664.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/dubopexozinar.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/xozagopopenerikenix.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/92654618721.pdfIn PDF document text
    • https://ons-station.com/editor_upload/file/tufawifo.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/dekezesajowesigasupop.pdfIn PDF document text
    • http://ty-int.com/files/files/27263281816.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/tuxivudigamak.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/54760403486.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613df0d8000dd---54450842859.pdfIn PDF document text
    • http://poultech.net/d/files/40340096783.pdfIn PDF document text
    • https://truongdongkinh.phapluatvietnam.com/upload/ckupload/files/fisetalakatufav.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/11759343587.pdfIn PDF document text
    • http://nfc.soo.jp/file/9387046863.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/zejulemedukebob.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/dimonavaninebadawifoj.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/poruxiwegeji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=iso+file+for+windows+7+64+bit+free+downloadPDF 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_off0000af3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74F 16712 bytes
SHA-256: 282061dc0e99a797121731465386e34b502b3a9ba0115bae0b580d6e2f4d1b54
font_02_sfnt_off0000f23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23A 10820 bytes
SHA-256: 82c3685db730b107c170e9c583546a144b6611e6a678a90f954146bccba271ad

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