Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16a92ab7dc77b8c…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 23:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5325eceab90c93ebc642e7ebb9a7832e SHA-1: f9d943233592e22c141b0415dc23e70d8df3088e SHA-256: a16a92ab7dc77b8c8624a979a11cce22fe998ef1a37ac4eb46ecf8733e59a029
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://crewmak.ru/uplcv?utm_term=how+to+draw+scissors PDF link annotation
    • https://luminex.pl/upload/file/nufobifi.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/gewalezalofukipi.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/kuvevozefigijadavodig.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109151554004857.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135daae3c0bf---22868547482.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/gibuxodisixamedagasu.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/napox.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/70265409588.pdfIn PDF document text
    • http://www.moyekolodin.com/files/madadibu.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/93885061875.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zenetojopofiberipa.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/wokujidarinonevuxivixitad.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/fasisugukodesu.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/3265715110.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/pavexawawuz.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1630686745/files/81946923136.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/vabofunorijewogeloxibejo.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/nijip.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/35003219554.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/buruv.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/buzepemasakirufomosovoda.pdfIn PDF document text
    • http://litroshaber.net/resimler/files/guvaponojalutitis.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/nubemu.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/37627424178.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/taratonujekujufirezebize.pdfIn PDF document text
    • http://newshop.jp/archive/file/2233610820.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_off0000d383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD383 17160 bytes
SHA-256: fa86f4116ff2f6f310a6e12bd6508efd808b67facdbe2e6656aebd087e75b039
font_01_sfnt_off0000ffb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CF 10160 bytes
SHA-256: 7d0ece7f8e9606949c7b856cd7c7fc07e38ef9b39d2d15a1d8673278df9d045b