Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a7c05cde582ad45…

MALICIOUS

PDF

69.1 KB Created: 2021-09-29 11:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e7526c38b1d953cb682a81a21b1714d1 SHA-1: 1feed51ffe1f1ba4e60922b05e3404d4d89def67 SHA-256: 7a7c05cde582ad45aeda09a3f2d58c885c9543f2323cbc9f3358a4735ecbcb64
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing or trojan variant. While no scripts were directly extracted, the PDF structure and URL patterns strongly suggest it's designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://ledseoul.com/userData/board/file/xebosexanuzabidozoduba.pdf In PDF document text
    • http://faw-asia.com/image/upload/files/32578085469.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/binuvomepafa.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/8482657829.pdfIn PDF document text
    • http://vhktn.at/images/content/files/31003586547.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210916042236.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/dobisevaviguxi.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/59626321633.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/22293849868.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/37604488508.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/dumoradojifavelasu.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f736024b90---visokewedazovifipevo.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/daresetu.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/gumabofarizeganedevere.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/27926640592.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/26710565034.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/dabovevedu.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/94983430086.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/misowokibo.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-8/20210908005339649553.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161426b74ec759---3529280953.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/97213383703.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/xapikebujok.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/61161146187.pdfIn PDF document text
    • http://bociany.sk/media/file/maxilagojeja.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/tewumazapis.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/kexidutotuwajisinosev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=auto+rotate+app+for+androidPDF 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_off0000b27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB27D 10360 bytes
SHA-256: 5981ea1e9841539129087ced19ddbebe223423316589ab70e169ff422604306c
font_01_sfnt_off0000c9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20C 14688 bytes
SHA-256: 08556afde78f186b748829aeeb2558c870b483a68b9e3ebb3a79a0cf8efe4753