Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e99dde7e953818d…

MALICIOUS

PDF

76.7 KB Created: 2021-09-20 04:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b13ea7b642c9d6ebd5a852c087f26ae6 SHA-1: 761c7ed896abb10101142649d209ecf89acde9ca SHA-256: 3e99dde7e953818d79745bd719d69a068fab26436aaa0aaed4b7c9e49144a8b3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were extracted, the presence of external URIs and the ML classification strongly suggest malicious intent, likely for phishing or to redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://salamino.pl/userfiles/file/73865536296.pdf In PDF document text
    • https://hbphoto.ca/resimler/files/gavotefuvufuragabutufize.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/lobowatu.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/74855255237.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/57814713327.pdfIn PDF document text
    • http://litroshaber.net/resimler/files/julumupaleloju.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/xikefoputelevu.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/af95c544a1a1ffeb9591911f45cc8615/56210128718.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/lojasekuf.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/kijubon.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161420f10a8521---28070023613.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/94689860750.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/lubanutako.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/23010688357.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/wiporevudejexawuna.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/posuninoxovowa.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/zopekuvagagebozidabamisi.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109150954439443.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=scribbles+horror+gamePDF 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_off0000ca1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1F 10688 bytes
SHA-256: b24cf6ad623ad5c7394575136e4e3969837b4240db030afa7a4f49b08cef5a0c
font_01_sfnt_off0000e293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE293 16808 bytes
SHA-256: 5895561e735c09ba214c5c5764dc582e50e1f62be219323c27557ec2bc83129a
font_02_sfnt_off00010dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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