Malicious PDF — malware analysis report

Static analysis result for SHA-256 398c4b03d5aac176…

MALICIOUS

PDF

69.5 KB Created: 2021-09-30 23:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ceb0630ea85b0077abf9ab44d40bec36 SHA-1: 47f01fc392782b3e815436d114485420f73788b1 SHA-256: 398c4b03d5aac176b69e514054f7278dc878e1bd748cfcc2abfd29c4c675b97f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URIs. The PDF structure and embedded URLs suggest it's designed to lure users to potentially malicious websites, likely for phishing or to download further malware. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://catamma.ru/uplcv?utm_term=unlimited+money+shadow+fight+2 PDF link annotation
    • http://werder-ritter.de/UserFiles/File/feputovefesusinaz.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/gupumelewo.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/zagemixixaxujexosu.pdfIn PDF document text
    • https://jobtiara.com/files/files/8108139554.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/68525132255.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/silinuwatururapinokaded.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/lexakunimajemamoxivegakav.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/gasupotimam.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16138707969ae0---33903937993.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/97520327250.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/lugipufaminuzemoru.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109220811159700.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/78034761640.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/16056433145.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/64007020245.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/wezopi.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/42249522952.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/faribibipupazizububizopik.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/foxituxujala.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lezenasefete.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/58866590022.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/25044566947.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/88127129174.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/pasatu.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/gapabofujifedo.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/safulewubivu.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_off0000b0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC908 15048 bytes
SHA-256: 3b4a2ed42ccbcd84e79746fcbb18267c66699bbc23f656124c4f2767b6a04c71
font_02_sfnt_off0000ef12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF12 11028 bytes
SHA-256: 55c7b3c9466168fedbf8b58cd6ce1382e2dca82e9b1206a9adea94b386b35216