Malicious PDF — malware analysis report

Static analysis result for SHA-256 b372c50de3a7fc6c…

MALICIOUS

PDF

77.5 KB Created: 2021-09-19 14:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 451608820fc17663affc34c2dd1a268c SHA-1: 476183c6ea39b72ed5a04f81eae10c857266ad1f SHA-256: b372c50de3a7fc6c5341bf6899c26b9bf213a91a1423ef80ef6f89f7cddf2a52
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URLs, including one identified as a link farm on disposable hosting. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded JavaScript and external links suggest an attempt to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://wastran.ru/uplcv?utm_term=samsung+kies+for+android+free+download PDF link annotation
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141e6177b00b---55171047749.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/gafogujava.pdfIn PDF document text
    • http://rugsdirect4u.com/uploadedfiles/file/muxoboseresafewade.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/romepajorerebunogiki.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/birugevofuwapoxo.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210906184915_1830385616.pdfIn PDF document text
    • http://na3.it/misc/file/tazedizofitotam.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109012302311694.pdfIn PDF document text
    • https://businesslife.com/content/file/satelodonuxatif.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/97331739381.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210905174746.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/79512090533.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/jujad.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///19823820324.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/74945175171.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/2835167551.pdfIn PDF document text
    • http://anpo.vn/upload/files/28592455861.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/34625293055.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/peligewivutamesizuderak.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/23433408050.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/398028888.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///2441763739.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_off0000c95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95E 17552 bytes
SHA-256: 9dcee72e2fb69603d55f714eca32794f3793f6b5278ea67ef02ee04e1aa6761a
font_01_sfnt_off0000f755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF755 10952 bytes
SHA-256: 0f234f6a9753a039f6d30325b27ffe188b687b493657f401e391182dffc0ae91
font_02_sfnt_off00011088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11088 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.