Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef56b9b71c0d172d…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 08:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f393bf130aa883e0b72973b65f68082c SHA-1: 98fdb09af3bfe2b2ffcca28d6815cf646b049cb4 SHA-256: ef56b9b71c0d172d4c50a736172c0fd848ae4bda48bed3e0a843ea235d110858
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=download+geometry+dash+subzero+mod+apk PDF link annotation
    • http://share-world.tw/userfiles/file/44109616920.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/kinaxuvu.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/vefimebilegetujumakarure.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/9248337731.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/zarugedi.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16136fc3091b51---wubisetezolawutesiwada.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/venukaxipujulapinafov.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/17383686605.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/71691712556.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424ba4c09e2---96727556347.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/ziwumigodadu.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/tezulaludeduso.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/jazasotakoworibas.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/jinubulelas.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/ronaxujutileremenopofi.pdfIn PDF document text
    • http://live-net.it/file/jowunurenuvo.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/7187067726.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/bimalorimafufiwenu.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/90314919808.pdfIn PDF document text
    • https://mcsfood.com/images/file/87790840847.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/98537089614.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/ruzevavogul.pdfIn PDF document text
    • http://medrea.ru/upload/files/58027912099.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/sositopolaletokexowo.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_off0000d831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD831 18008 bytes
SHA-256: cdbf08dc46a8c88e1fccb85558b048e84ca72155f75cf6815267d9c148788e0b
font_01_sfnt_off000106c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDF 11340 bytes
SHA-256: 46eeeef25ced9cc5c8722e2097b76e72c45b6f1051e4d73f704e860ff27e82c9

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