Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfab1ff235350e32…

MALICIOUS

PDF

80.7 KB Created: 2021-09-10 10:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9ef2fbe06ed9f6bf9e34080d5e7b140 SHA-1: fa9fe5fe579c597421004407e262bfabf0a1a737 SHA-256: cfab1ff235350e326262b54bfbcbc9c07d2cb583c7d9dff47f68efa2eff8e31a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is part of a link farm, likely designed to redirect users to malicious sites. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.bash.cl/media/file/27290565276.pdf
    • http://abwbaltimore.com/uploads/files/tiniwomuruwejad.pdf
    • https://congnghiepxd204.vn/upload/files/vatudodutemere.pdf
    • http://hfnhsw.com/upload/files/55984625891.pdf
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/2586578618.pdf
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/20948163082.pdf
    • http://ashleymongolia.mn/uploads/files/493887290.pdf
    • http://vucert.vn/uploads/files/mofikev.pdf
    • https://rieker-consulting.eu/files/file/21701995735.pdf
    • http://mastera-mix.ru/ckfinder/userfiles/files/88355884968.pdf
    • https://gionggiacam.com/ckfinder/userfiles/files/66894175211.pdf
    • http://bawaconstructions.com/editorData/file/ludabogerakadutuvopiropu.pdf
    • http://bisenzia.it/userfiles/files/9144173500.pdf
    • http://mebco.ru/images/file/giwerati.pdf
    • https://westhygiene.hu/editor_up/gotuzejos.pdf
    • http://rhondachem.com/d/files/tedukafasumafasujeliw.pdf
    • http://hvezda-pardubice.cz/files/file/8634170215.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1612f02100c02b---1554754340.pdf
    • http://goldia.cz/data/file/wakosabigawufisuse.pdf
    • https://markaoyun.com/calisma2/files/uploads/fuwezomuf.pdf
    • http://clubselectionvoyages.net/images/file/zejejonaverurozopamevomar.pdf
    • http://sghr.ca/upload/ckfinder/files/fufomogurovijabijul.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/6114ef3d505a4da0ddc6ffda8f3602f8/wakadolofibuxifukij.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=spoofing+pokemon+go+on+iphone
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F1 16792 bytes
font_01_sfnt_off0000f003.bin
69ccbb2202b44bbec2bcc4b306b75abe558a1854b898a82ca1d24de3ad998c99
pdf-font-stream PDF embedded font (sfnt) at offset 0xF003 17700 bytes
font_02_sfnt_off00011e18.bin
7c7f63accda573a5f9485fc206d016dadfebfe8b615bd1a3de319a586f698e79
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E18 10396 bytes