Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f16a7e405cd4252…

MALICIOUS

PDF

71.5 KB Created: 2021-09-28 21:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: dbc45e7195c8697263fb33a4a1d4e91a SHA-1: b12fb5a56f1de6076b22ca6219f5fa6f7f19ff6b SHA-256: 5f16a7e405cd425229ee15a67364a66ea85a0052ab78ec0c6a2af88805070135
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a phishing or scam lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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=hard+unlock+pattern PDF link annotation
    • https://www.domosystem.gr/ckfinder/userfiles/files/99804608401.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/wumasemibixitide.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/44818368230.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/27492753588.pdfIn PDF document text
    • http://minhanh.com/files/kopofitikipimoxozelasimi.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/98524884919.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/falezagemaxerewibevazole.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/zomuxovuwavazepuz.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109021237568344.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/15/fupexisiv.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/dipuzuzikupubawerawoki.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/5806958710.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/43384496949.pdfIn PDF document text
    • http://futiandj.ntgis.com/UploadFile/2021/09/25/file/20210925_110235_182.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/desep.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/vofidilusawamov.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/34560036542.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/82204713009.pdfIn PDF document text
    • https://cityface.cz/res/file/doxalojulomal.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/rukiledeganezexinoruzejex.pdfIn PDF document text
    • http://china-guolin.com/filespath/files/20210909135135.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210919082552.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_off0000b375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB375 17516 bytes
SHA-256: 66d22699e603a59a60d6de6ed352e867f7d162e7c43aa9545bd6229f466b7990
font_01_sfnt_off0000e0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C1 10428 bytes
SHA-256: 0f20ad775c868490f3c251d3a6fca605c7dbe9034bd8fbc86f08bc812e1a1f04

Open this report in the interactive analyzer, or submit your own file for analysis.