Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ba5cfec1b28e8c2…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 06:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb4b693f45967a468d53b34f31527874 SHA-1: f9ac81c66353990c72a1b64a5259e08d6a963980 SHA-256: 9ba5cfec1b28e8c200147b7dd14c579b5dc68a88154e5bd12fc2cb4317731744
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm on disposable hosting, suggesting an attempt to direct users to potentially malicious websites. The presence of embedded JavaScript points towards an attack pattern involving client-side exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crewmak.ru/uplcv?utm_term=how+to+reset+a+samsung+galaxy+phone
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613433d0647fb---muwisewusewabalupufamiwez.pdf
    • http://el-system.jp/uploads/2012/files/95207765388.pdf
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/jarugupepewekosawefalevet.pdf
    • https://leo.tw/upload/ckeditor/files/somutabugabotererelalu.pdf
    • http://netart.hu/userfiles/file/61156905694.pdf
    • http://getwealthythisyear.com/ckfinder/userfiles/files/11290116415.pdf
    • http://orenprom.com/img/account/file/zovuxuvudobifuxozuj.pdf
    • http://unseenadventure.com/userfiles/file/xuxulokenawobapixenejat.pdf
    • http://kamennykoberec.eu/editor_uploads/system/files/17744390758.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cb833bf82---mamovisujowezilapegejawo.pdf
    • http://adimhukuk.com/resimler/files/98688303998.pdf
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/55800090020.pdf
    • http://nowator-zpu.pl/userfiles/file/61329247293.pdf
    • http://kimsanghun.com/upload/userfiles/file/20219121111142606.pdf
    • https://livresdarts.com/ckfinder/userfiles/files/sabitedinogezeguxalexa.pdf
    • http://beiwendq.com/data/attachment/file/99264063487.pdf
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/vetumunowup.pdf
    • http://kukdae.com/files/fckeditor/file/gososet.pdf
    • http://escrima-rlp.de/userfiles/file/5052307471.pdf
    • https://portalbime.com/UploadedFiles/New/file/88799079677.pdf
    • http://gandolfiarchitetti.com/userfiles/files/75171583880.pdf
    • http://yuanjiangchem.com/upload/files/25189571411.pdf
    • http://tipkeo.com/js/ckfinder/userfiles/files/suvibameroxapevilufoki.pdf
    • http://abwessex.com/uploads/files/penezedavozunut.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DE 16792 bytes
font_01_sfnt_off0000eaf0.bin
080f1b8adf44d8d1bcd4f89ecbd66519a490a49c670915e2d0654422bbe0b821		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF0 18164 bytes
font_02_sfnt_off000119a9.bin
1e2431f1f47a2d07b5b537172753b663aec5cf2a26b554eb0fda63a81eba678c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119A9 11000 bytes

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