Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2eba8893609f918…

MALICIOUS

PDF

83.6 KB Created: 2021-09-25 20:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: f743bd8863c4696b00978317f09d7210 SHA-1: 855cdf4fb5b6dbd19a4ea80d0b463a8e407e6cd3 SHA-256: f2eba8893609f91822caeb69bbb05ecdf2577087f4eefbcbe23b85c724d9a9a4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous external URIs, many hosted on disposable domains and employing UTM parameters, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://synerhu.ru/uplcv?utm_term=campbell+biology+class+12+pdf PDF link annotation
    • http://hairfibers24.com/upload/file/80110701340.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/mipizarunexitojon.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/jusavometobegijemi.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/29212545586.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/fubatolawuterori.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/55044813154.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13256807474.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/pisuvatusovenusidem.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/68594699744.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/nofaredarumadag.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/nobirevorobu.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/52047162877.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/toxowef.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/kutikapujikixu.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/nurijamabuwukis.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/58577212446.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/maxetopuveniwisowiwapa.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/kaxexixamewiveriretujo.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-7/20210907000530102696.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/42683321433.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210918002425.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/76264618793.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_off0000dafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 19284 bytes
SHA-256: 10a5f799e7ddcb9bbbda5f96617d754a3ce5ab703f8f2d9edd25844067db9fe7
font_02_sfnt_off0001251b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251B 11116 bytes
SHA-256: aff70de57c9fcd526fff1f42f57d1aab3974b0d27a9d3043b6113470f85ea0c2

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