Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff26e311e72fc4f…

MALICIOUS

PDF

79.4 KB Created: 2021-09-16 00:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e314d157cb6a3f1c68e2ae1d687db58c SHA-1: b885595bb09753807b015c5ea199d8c4e109b11e SHA-256: aff26e311e72fc4fa6664eb6fe7f1339fa47f085e4443dbe86d07d4404ca5f8d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous extracted URLs suggest the document is part of a link farm designed to manipulate search engine results or distribute further malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific function beyond the link farm activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://atiksigorta.com/files/niminovoboza.pdf In PDF document text
    • http://arunimaflavours.com/userfiles/file/67850004478.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/85974318985.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/91725939744.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210907131825.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/xuwekivuxiwuwefuzomupolo.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/wevanomojuwibe.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/lizezox.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/nezugebitufi.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/24023422841.pdfIn PDF document text
    • http://makaroma.fr/upload/file/wejovevorevedow.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f76cb7bc99---kekonizafozoxezu.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/wuwuzujufifuvemilijeri.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/24008010317.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/xoxasafo.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rokibukona.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/79488132502.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/tetuzeji.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/jiwux.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/gigadenivelovo.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210914083456.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=stickman+warriors+dragon+ball+mod+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_off0000cdf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60C 11116 bytes
SHA-256: 6cc3aaac96a19e5a0fe762065de35519e652dd3bccd46e055792f1dea5495d24
font_02_sfnt_off0000ff8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8D 18620 bytes
SHA-256: a111be64251843289ceb653bc533f5dbf66b05e1b8b282a9ec38aa12e1d393e9

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