Malicious PDF — malware analysis report

Static analysis result for SHA-256 5455b64766536b32…

MALICIOUS

PDF

71.0 KB Created: 2021-09-27 07:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 003590b33d7f69603adf27c5a60f3afc SHA-1: 8810919216b02fe30ee77f2854f4258d5243f50f SHA-256: 5455b64766536b3298f3b6d5c351c76ceca2f7327dc7b84d2c319ae96ab6e49a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of an embedded JavaScript stream and numerous external URIs, many of which are on disposable hosting or redirectors, strongly suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains metadata from wkhtmltopdf, suggesting it was generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://irlanc.ru/uplcv?utm_term=shadow+puppet+templates+pdf PDF link annotation
    • http://80tner.netsociality.com/upload/files/zodapopodowivepuduxow.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/46530976460.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/mibatubigexax.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210905100241.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/hhjuggf2u6ulh0ube6kjfofop6/19200729152.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/60310915646.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/lomikexuwemogojusowotewa.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/kogatodiwamivitutebovevox.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/19507766961.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/a2061bc6552b4d5b77fe6f47e6a54ca9/rivutodamovabit.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/xoxozivurewafipof.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/tatimusunonufelulo.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/76877857243.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/8332311915.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/85446952545.pdfIn PDF document text
    • http://lawngo.net/fckfiles/3009316821.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/1951270874.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/jatiwuderugeko.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/zixemesapawibugunikaku.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/piluvupo.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/12351780235.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/zoduzitiwoxupamo.pdfIn PDF document text
    • http://juncheng.tw/upload/files/21943235648.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/wetilumazij.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/48914890245.pdfIn PDF document text
    • http://tcihk.com/userfiles/fejofigamoxere.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_off0000b4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E6 10728 bytes
SHA-256: dd7cfc6903b8cad8ad4fe473b05bfaee6389b4904453e19a6475eb7b8c0dfdd8
font_01_sfnt_off0000cda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BA 16120 bytes
SHA-256: cba63e1c7d955dc70098aed097690e47eb014a32e4182b7810746607257e87dc