Malicious PDF — malware analysis report

Static analysis result for SHA-256 f892fbd65baa7e6a…

MALICIOUS

PDF

68.8 KB Created: 2021-09-22 18:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2757f865bdf297c6883c3eea127b412e SHA-1: 63e10c22da3fad278c71aa3ab1e040b68d8d1091 SHA-256: f892fbd65baa7e6a2ca226b8d8ac023ca228d9ddccc54e86b90238504396a374
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier also identified it as malicious with high confidence. While no scripts were directly extracted, the structure and URL patterns suggest an attempt to redirect users to potentially harmful content, possibly through a malicious JavaScript payload embedded within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 4

  • 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://angel-conference.org/upload_fck/file/2021-9-5/20210905071146398620.pdf In PDF document text
    • http://citranco.com/users/files/bitun.pdfIn PDF document text
    • http://redactron.com/userfiles/file/76641126309.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/lobizamokezusonifagos.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/72166333683.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/poworuvowodesano.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/sisos.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/rerumim.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109172347046950.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/33460328466.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/58950332172.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/6712898836.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/fupazugizizufidekirijoke.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53625834997.pdfIn PDF document text
    • http://espokebar.com/uploads/files/27542646479.pdfIn PDF document text
    • https://coevent.ru/upload/files/tunevipuxuvexerudosexedow.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/87557184039.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/pupufum.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/bb97025949b420c88cfeab8b13807eb3/32149857110.pdfIn PDF document text
    • http://aurora-c.jp/files/files/61710825290.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/65d2be555963c5114af402eccbae893c/12468207758.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/rafibe.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/xotijeporexoradesim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ml+hack+skin+apkPDF 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_off0000b1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E4 10108 bytes
SHA-256: 27668938c74eb9c3e9e1f1628909909613cfce72703ed87577df1bc7b1fb1dea
font_01_sfnt_off0000c850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC850 15108 bytes
SHA-256: 01394aee78f26cc92786202f3f0dad1ba5983a14097b11173a7ba7ab72dd1bf9
font_02_sfnt_off0000ede5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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