Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d187317a35b321c…

MALICIOUS

PDF

83.7 KB Created: 2021-09-12 18:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d7d3656c2c20e4f049f69cf1c1c782a1 SHA-1: d8ebf8a4152f0ea6aa0f9c61b086d4680cffe86a SHA-256: 4d187317a35b321cd5535611c95676bb6371638c26c3377aaeefd740b1edd9a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The PDF structure itself is also suspicious, with duplicate object bodies, indicating potential obfuscation or malformation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/16f8b029ef80c8f2e4af38f4961db69f/34343674054.pdf In PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/xatedasopavinasurubarof.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/robovapirojuvikogatuva.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/xajudoj.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210908052955_744517659.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109080945416706.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/totuxaga.pdfIn PDF document text
    • https://loyd.rs/images/file/82922468276.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210912081337_764980261.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/xomotimin.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/rokikogogasa.pdfIn PDF document text
    • http://melabo.com/upload/files/tubome.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/6481918564.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/kagewujajobazagot.pdfIn PDF document text
    • https://armenia4d.com/contents/files/90489532620.pdfIn PDF document text
    • http://esejsc.com/upload/files/32779546227.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/vukofijatu.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/43764298413.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/puvibapizagukimuwut.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/22336214515.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/xudedu.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3e1a19219---worazakemuxajilojamura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=j7+prime+2+flash+filePDF 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_off0000e1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA10 10460 bytes
SHA-256: 8c0abf3d60e5202cad207c63d9af9a3be7b0b750879aacc3494ed174e53fbbe9
font_02_sfnt_off000111d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D9 18700 bytes
SHA-256: 2ccb1b3b4ed82429900b2bd1c178f0c3f7bfc5a8dc0caae3c89a9368f905654b

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