Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1127283c0a6ce5f…

MALICIOUS

PDF

68.0 KB Created: 2021-09-26 17:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 876bc396c356cba3475106b305af502c SHA-1: 7e88fc18eb9b5078020ccc151228d5d5bce5835a SHA-256: b1127283c0a6ce5f51ba294381c122838718e158235c8d188e669cbabf0be4f4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to potentially disposable domains, suggesting a link farm or redirection scheme. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://dh-cell.com/ckfinder/userfiles/files/25492227.pdf In PDF document text
    • https://khangle.vn/uploads/images/files/29745085120.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/8676528853.pdfIn PDF document text
    • https://vpmemorial.net/images/file/sodunod.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/vivajafabuzo.pdfIn PDF document text
    • http://wamer.org/userfiles/file/vakikema.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/77237549601.pdfIn PDF document text
    • http://hodori247.com/uploads/files/32477970063.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/jifejorikeponevaponev.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/62410978405.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/fitobemisitifa.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/40560180428.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210917190641.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/70941461699.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/67828121297.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/kijixorelufofaru.pdfIn PDF document text
    • http://kcwoman.medsoft.kr/pds/userfiles/files/widosolejufunorerafoneze.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/lokigujojuwideguzof.pdfIn PDF document text
    • https://cncunse.com/d/files/volibazuguveratunotudoza.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/29590341377.pdfIn PDF document text
    • https://koratspring.com/upload/file/106669529.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/lss71dgcadf5eli442r7qqp3i3/revejizasubemerew.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/38505441811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=sim+status+phone+number+unknownPDF 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_off0000ad10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD10 14512 bytes
SHA-256: b41d90ba3519066e1c3dbb8ceb84d5c50991f5ab4b887fe2ec59841c37add1af
font_01_sfnt_off0000d172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD172 10964 bytes
SHA-256: d6b3b3b7834cdb3aa1c2d806610cbe6d2a068df04a333a3c77bef4ecdcd1da41
font_02_sfnt_off0000ea89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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