Malicious PDF — malware analysis report

Static analysis result for SHA-256 e45c462edd3aac85…

MALICIOUS

PDF

81.4 KB Created: 2021-09-11 12:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4f3d4fe68a89357bc269f6d8bc0bc498 SHA-1: f30b28e5713c7b6fd57ed4f0d9dca74c6554ec77 SHA-256: e45c462edd3aac8541650c0bbfa11b6bcb113deb22e00b6aea9e63366b85c825
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, containing numerous external URIs. The document body is heavily obfuscated, but the presence of many URLs suggests the primary function is to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://medvor.ru/uplcv?utm_term=best+sites+to+watch+sports+online+free PDF link annotation
    • http://toyteepee.com/uploadfiles/file/210902065746105056vcnkf9.pdfIn PDF document text
    • http://zaiger.ru/img/file/78120902537.pdfIn PDF document text
    • http://gaudi.tw/upload/files/9444771127.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/52a6708a935e7a445d3ac80ab3aa27e7/dixor.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/reluwimimuta.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/kugudipif.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/romotabetekud.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/jotufatuvanewepikevasov.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/11859370359.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/mabixokodorawazoxenopuf.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/muguzi.pdfIn PDF document text
    • https://expomediainc.com/upload/file/88326821883.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/44859130618.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/96271431881.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/tovobixezepasisop.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/befukomokir.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/venaparitagilogukisag.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/79492206517.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/fijolomirevuvij.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090823163143.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bafcc11502---16383077738.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/xakebax.pdfIn PDF document text
    • http://azizolace.cz/images/file/burokininineloja.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/80572941051.pdfIn PDF document text
    • 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_off0000d9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FB 10716 bytes
SHA-256: 737cccf9b6f9f68b6ce2a327d955e2bffb4c5796266a2debcf0a2c8d6b311c8e
font_01_sfnt_off0000f2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABD 17360 bytes
SHA-256: a5f057c220850a63266244132626eefd905e8a9953ea42e6dbbd8ff74d939080