Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b10c30ac2c9afbd…

MALICIOUS

PDF

70.0 KB Created: 2021-09-18 15:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 493817d05e736c15c84c5217fe1b0a06 SHA-1: 2650af68916c8c2ce0c56fa1c056c7faabd0ad28 SHA-256: 2b10c30ac2c9afbda38488f00f3c1b3a859e7e0f29a39a7ce7f3cf5689373528
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external URIs, including one pointing to 'catamma.ru' with a query parameter suggesting a lure for movie content. The PDF also functions as a link farm, directing users to various disposable domains, which is a common tactic for phishing or malware distribution. No scripts were extracted, but the presence of external links and the overall structure strongly suggest an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=avengers+full+movie+online
    • https://insolite.lu/img/userfiles/files/12671285669.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403d1a67bac---26526804456.pdf
    • https://fundacjaartfreeart.pl/userfiles/file/pugifuzesurabebafuj.pdf
    • http://isotope3.pm-ural.com/uploads/files/nugoge.pdf
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/88004159160.pdf
    • https://chulintemple.house-well.com/CKEdit/upload/files/nomoresitoxesubowinu.pdf
    • http://pzhjintai.com/upload/files/zoxup.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/85f9652771d032ac5471874bb817bc36/tilokaxudezis.pdf
    • http://mea-travel.pl/userfiles/file/75045062724.pdf
    • http://www.wiz-fac.com/uploadImg/file/65594423038.pdf
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/48810714175.pdf
    • https://n-zvuk.ru/upload/file/95440004212.pdf
    • http://lex.tj/img/file/lusakazag.pdf
    • https://topconta.ro/userfiles/file/40088107251.pdf
    • http://orthocarecentroortopedico.it/userfiles/files/bowigozisuwax.pdf
    • http://seosanhrd.com/userfiles/file/rexosizokanafomamisakana.pdf
    • http://torby.kbo.pl/ckfinder/userfiles/files/47921691483.pdf
    • http://ramenhajimetustin.com/uploads/files/66205332810.pdf
    • https://halead.com/uploadfile/1630738625.pdf
    • http://vidol.eu/userfiles/file/moruvojamizedanozido.pdf
    • https://h016s5or78-du3.com/contents/files/xuxedapebajejiloxozuwudor.pdf
    • 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_off0000b110.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB110 16792 bytes
font_01_sfnt_off0000c927.bin
afdae641f3d0be0c5fd98a750feef35862f0a81fefca631662cdbf43275f8244		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC927 10444 bytes
font_02_sfnt_off0000e0d5.bin
c29aacb3cf909874f367ece13faca758da48a1b17bbec754d924e5a2ccc79d1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D5 16332 bytes

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