Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f73e54eaedb974…

MALICIOUS

PDF

70.7 KB Created: 2021-09-29 09:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0b8bab4096e745f62e27071a0303905c SHA-1: 424a89e8658e339a1587e047246504c539c442ee SHA-256: b2f73e54eaedb974697d444e60a48ee58d5b54c0ec209d572742a558fa81e3b3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifying it as a link farm designed to direct users to various disposable hosting sites. While no scripts were extracted, the nature of the embedded URLs suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/vunamikone.pdf In PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/tesakutefap.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16152d3181bf49---26835906182.pdfIn PDF document text
    • http://strandedtattoo.info/file/lugopuziwa.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/pasudebe.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/nezurodasizosexunes.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/gopufotuzomifipi.pdfIn PDF document text
    • https://diphong.com/uploads/fuxawisi.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/K1tOh9iGWBfP.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/mesezurezadojuwetiwiva.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/jujosotoviraxi.pdfIn PDF document text
    • http://peoplefoster.com/pliki/wipod.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/tamodisubafisugijexedibud.pdfIn PDF document text
    • http://tion.hu/upload/file/kilatuxejekudoxowagan.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/79685311513.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/siwodilidum.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/85949446450.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/porunipilutafukazuma.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210913020110.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16144b98527da9---82117508380.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/pivopexiluzonomavu.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/40616054584.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/zidamutopikoroz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=jennifer%27s+body+streamingPDF 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_off0000afc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC2 10932 bytes
SHA-256: 06c7f848bdc1f3695596c7839030e2411a0f88393ca11e8177586240e196c97d
font_01_sfnt_off0000c8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FC 17476 bytes
SHA-256: 659e5b4c123ca6a9d455bf7e9cd758d632cdb93c200f795dd56352cc877e3d20
font_02_sfnt_off0000f55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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