Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a797c8bcf59ca2c…

MALICIOUS

PDF

83.1 KB Created: 2021-09-20 08:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 0fc339f358ddbfc1b03438254d21010b SHA-1: 4269c3fba4c276346d28cb0749afed6c1dad9d3b SHA-256: 9a797c8bcf59ca2ca8f6473da1e660f02ec0bc12bf9571946208adc8dc044bd4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, suggesting a phishing or redirection scheme. The PDF structure and embedded content are consistent with attempts to lure users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=dark+mode+on+any+website PDF link annotation
    • http://kssi.ir/public/userfiles/file/gefazanodorazateji.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/44521298814.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/11313556624.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109191702416254.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/61149102596.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/34089620047.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/49572411074.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/68484150243.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210908_8C2A38AF1514920C.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/jebomev.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/81424070810.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/mafexejaxote.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/wimopuxolibawuvixog.pdfIn PDF document text
    • http://donghotam.com/luutru/files/77450308726.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/fb217b302b139366426596a436d145db/penipubuxanibil.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/86938841635.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/ziluwixepun.pdfIn PDF document text
    • https://clinicscrm.com/img/files/piramufupabesumoju.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/dumuzis.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/qqptp6tmeliidhi03oqm3gojqe/83358601760.pdfIn PDF document text
    • http://technocom.pl/editor/file/xitidozewe.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/48449879867.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/sajarugalexosegawesexatu.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/navovufawax.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/xebedodado.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_off0000dda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA4 10796 bytes
SHA-256: 55a0c7e5ab160640adf15349e2354d92bc43196a72298057da169a0df7f294c8
font_01_sfnt_off0000f695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF695 18588 bytes
SHA-256: 3808eab2f82142d140c59318770810367177d33c992aab6417dc7bd2f4130ae6
font_02_sfnt_off00012683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12683 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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