Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5abfc0d0c9991d…

MALICIOUS

PDF

86.7 KB Created: 2021-09-18 07:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9614a64ff04e3b3fc003f275ec77b108 SHA-1: 07b5e9207031616ebd4f573e9ad91459591ee0bf SHA-256: 5c5abfc0d0c9991d8143cf04b2eb5b02b9a50481224020839b3482cdedd35a9f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, a common tactic for distributing malicious content or conducting phishing campaigns. The presence of external URIs and the overall structure strongly suggest an intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://oniceh.ru/uplcv?utm_term=play+audio+in+android+studio PDF link annotation
    • http://ginzaoakland.com/uploads/files/27686452761.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/zaguwudeguvapar.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/80808803175.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210907151020.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/3461961716.pdfIn PDF document text
    • https://km2804.com/ckupload/files/87071863737.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/32915105352.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/65109811549.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/19470700297.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/70820810392.pdfIn PDF document text
    • http://rs-entp.com/upload/file/41686461024.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/61074805448.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/63352826753.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/93bdcaf827949722cac3a8fa32f732b8/pinunotegikaxekaga.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/remomikuxuga.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/48473253776.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/97237998160.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/47554195506.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/c719f4ce669feca2d2249b9610467482/penatojunaforosuv.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/96113278613.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/54193328611.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/puduxinejefefojovi.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/44889269365.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/nevajesesanakumajax.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/wasutiki.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-7/20210907220445659953.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_off0000ef1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1F 17484 bytes
SHA-256: f49f6c925966bba4642a7000a4dedfcab9a4f7957d12dbfd1e267f4deaec69b7
font_01_sfnt_off00011d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5D 10324 bytes
SHA-256: 4ea84d2511ee439827c9ed7e673159a69a98c74972e9b3998839a88954d5e1d6
font_02_sfnt_off000134c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1