Malicious PDF — malware analysis report

Static analysis result for SHA-256 883e7641cc070bba…

MALICIOUS

PDF

75.6 KB Created: 2021-09-20 02:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9bf8cb08f2c7e4829f7dc64cad84ae5d SHA-1: bab434843aab12f274e36e8d4d8ead1988ea76fb SHA-256: 883e7641cc070bba62a3650043ed76351dea6aeba602d4eb0ed74b573d28c203
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many pointing to disposable domains, suggesting a link farm designed to trick users into downloading further malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://synerhu.ru/uplcv?utm_term=headunit+reloaded+emulator+for+android+auto+apk PDF link annotation
    • http://standartbio.com/fckfiles/file/fuxof.pdfIn PDF document text
    • http://gzmingjun.com/uploadfile/files/20210914_193037.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/dijoluduti.pdfIn PDF document text
    • http://kalikraft.com/images/file/wekoguzemenoduduveb.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/394759677.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/52188060189.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/8233134e7cd441c7e7c86c059b669c08/pubadiko.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/73623334015.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/rixebuxajul.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/rulupawodebuna.pdfIn PDF document text
    • http://shriramashramssschool.org/userfiles/file/11719544816.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/67202783712.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/70814874823.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/pemewekater.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/65330230133.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/87467576275.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/25228252678.pdfIn PDF document text
    • https://petribax.com/userfiles/file/44699531881.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/69884751926.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/88599332691.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/37948251098.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/ziporudawekedipufevi.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/bukovodudo.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_off0000c22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC22B 17468 bytes
SHA-256: 2355402553373ab0d89f6b995b69442b8f98b037bdeb8d2cf390eeea852575cd
font_01_sfnt_off0000efe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE9 10672 bytes
SHA-256: 4dec30e97474a041680c4f58c9c205dfccdf1689cfd20a41b45b4c03656e368c
font_02_sfnt_off0001083b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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