Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f4110aceaae2c4…

MALICIOUS

PDF

67.9 KB Created: 2021-09-29 00:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1a8487a533c479cf22a8b6b259e0aed9 SHA-1: 1f394554ecc4d489995d1e865c913cee8b6e0c18 SHA-256: e4f4110aceaae2c4d285c2f0972f8e8c3e6d16ebcfdb3037eaf3e5ebb8911d15
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF_JS heuristic indicates the presence of embedded JavaScript, which is a common technique for malicious PDFs to execute actions. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely redirects the user to one of the numerous external URLs found in the sample, which are often used for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/f7e57b1ba02a82c734c5470efe9d5140/36087791402.pdf In PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/99424769135.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/tipamugafogekabuwimijoze.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/kujumepolilewig.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/17161397857.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///22002533764.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/98818453736.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/mokikamon.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/5524777154.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/71553249816.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/bujufozejil.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/27361133759.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/5657789646.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/54944787514.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/79699294183.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/levikavaxawezuwabi.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210926224852938293x7wjre.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=alert+in+android+studioPDF link annotation
    • 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_off0000a848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA848 16908 bytes
SHA-256: 19967596c1ae041e82dd473fba5cb9fe7d344986e81657892ccfe261119aa976
font_01_sfnt_off0000d326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD326 10324 bytes
SHA-256: f6f07a85004d30e6479c906911a535bb3a482d88eb23af6d8be27eb4e0de5dc6
font_02_sfnt_off0000ea8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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