Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab9a3a1f1e32875…

MALICIOUS

PDF

70.6 KB Created: 2021-09-25 23:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5f87a052d9016f2adc299864af5aad0a SHA-1: 2261325ddf8fca7e58c4838c7dd7ae8dedae8447 SHA-256: cab9a3a1f1e328750f78c9e15bd62108c732a3fa2b76189c7332604a5c2d0f4b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is part of a link farm designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. The embedded URLs point to various PDF files on different domains, reinforcing the link farm and potential download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 5

  • 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.
  • 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://citranco.com/users/files/85645257877.pdf In PDF document text
    • http://355353.ru/userfiles/file/zigetufutowatozidu.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/sepugugopulopakedoli.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/narutatapoj.pdfIn PDF document text
    • https://digireg.li/upload/dimadupizolofukasuxifip.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/tosibudaxuxezosewotex.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/2797330647.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/88885346815.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/dusajarejajimozizi.pdfIn PDF document text
    • http://bdn10.cz/files/file/24873968821.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/19248206071.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/69164938540.pdfIn PDF document text
    • https://mihalex.by/files/files/nugefedowati.pdfIn PDF document text
    • http://rnralpha.cz/res/file/wurunefojuku.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/dujajimefonofif.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/69159065584.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/bl1kc9opunin82f83j5dklo74u/52505339447.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/31167525606.pdfIn PDF document text
    • http://newshop.jp/archive/file/jasaxek.pdfIn PDF document text
    • http://cannamelis.com/userfiles/file/22287023854.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/89612863366.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/bolesisejagowurogonenam.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/zafozibip.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/nesevumezejex.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/89701603623.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091801362673499.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/24043489913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=pokemon+light+platinum+nds+rom+downloadPDF 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_off0000b205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB205 11120 bytes
SHA-256: 7534303508ad458e7d0223029c6e26296087cba6f5d82611773d2c30dfcb6a00
font_01_sfnt_off0000cba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B4 15992 bytes
SHA-256: dff8b2b2908da0fe965a63807fe279e9a6ea3697479aa2028a7831bc6d3fcd6e