Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd85795b8a486d2…

MALICIOUS

PDF

70.0 KB Created: 2021-09-10 23:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4613412e80dcf0f4dbde76c270398040 SHA-1: c449dc3a3a0bff4f125b4d95c2def75c85093be7 SHA-256: afd85795b8a486d278f42f2e7982c2d6de16bd7b198a06d501d5d8e2b8acb939
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The presence of numerous distinct URLs, many hosted on disposable domains, suggests a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to exploit users via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://myphi.biz/nbloom/fckuploads/file/67723427551.pdf In PDF document text
    • http://sinsg.com/files/fckeditor/file/tulalobuvotoge.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/vanofebugazu.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/45065454524.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202196315426012.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/69789040927.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/98547265552.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/ralumogosaziduta.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/20585204369.pdfIn PDF document text
    • https://atlantidegattico.it/file/mofotewokogegu.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/58580837607.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/86326964748.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f2e67cd32---31898821303.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/36289332588.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/popuzine.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/sugex.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c7b2c91dd---93265125049.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/73547172683.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/dosivinar.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/vidibuwelibijumeporusa.pdfIn PDF document text
    • http://kahsport.cz/userfiles/file/rulododupitosejobukimifaf.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/45464003994.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/64719175729.pdfIn PDF document text
    • http://theponghop.com/upload/files/20717048123.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/99768185144.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=gta+5+online+windows+7PDF 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_off0000b63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB63F 14328 bytes
SHA-256: 24394167c2f860e7097fb9e7ab9d996c4518830e5a44c94d19daf9ade45af5a4
font_01_sfnt_off0000da47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25E 10448 bytes
SHA-256: ea659eb64352955af16578a10924ee4f8bf75d64d6e685f7544adca276221799

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