Malicious PDF — malware analysis report

Static analysis result for SHA-256 94d167f32e3eaf64…

MALICIOUS

PDF

75.7 KB Created: 2021-09-19 21:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 18b05cfddd78b314b208dfa0923b89ad SHA-1: 8b4504df2b249bf7a581e94236ebea94e0bf1537 SHA-256: 94d167f32e3eaf647836dc01386ef0c6a09d7088921100a740ea2da1dffcf22d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for phishing or malware downloads. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=talking+angela+game+free+download+for+android PDF link annotation
    • http://thietbimaugiao.vn/Images_upload/files/2728165326.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/merogir.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210906133721522.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/nuzimeker.pdfIn PDF document text
    • http://thecuriosityshot.com/66329371725.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/2362724644.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/wimubupebivukezexopo.pdfIn PDF document text
    • https://alpinashop.bg/files/4576686923.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/woxulazovonetivegogejegu.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/duxevoviwizo.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/bibivuxafax.pdfIn PDF document text
    • http://topp.pl/_topp/file/31768479288.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/lasevusikulir.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/88330525800.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/dirarapojomuris.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/goxokegodiwati.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/70913668523.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/86150149196.pdfIn PDF document text
    • http://tid.vn/upload/files/80277664140.pdfIn PDF document text
    • http://vinmexindia.com/uploads/19670878047.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf20467b32---13754460076.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/wixagurisekon.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/kakegaxonobajeg.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/nozevojanozo.pdfIn PDF document text
    • https://mkontroll.hu/File/ganijigiba.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/f8bbc0ea34033014da67ef1fb8bd74fd/diworakunupilexebubape.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_off0000c60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC60D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE24 10572 bytes
SHA-256: 6bbc56043635f8bc464f9f49e67d9c9c1301fadc0dda27f6379d1d5774334a22
font_02_sfnt_off0000f606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF606 16540 bytes
SHA-256: 9db85f64b1119ef727cfb17ee861d418939777cd0e25c8ad0b8f9da45d5c2c45