Malicious PDF — malware analysis report

Static analysis result for SHA-256 6528684f4188bb18…

MALICIOUS

PDF

83.1 KB Created: 2021-09-12 02:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9b3f2498b802c11f4cb56074cbe98f53 SHA-1: 31afe026657524f7a49838303e064dd4432fc860 SHA-256: 6528684f4188bb18edd470e371a95a9bb0b573582f0a6e5ba1c2227d6796e1d1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and utilize UTM parameters, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a link farm designed for SEO manipulation or traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://pixomot.ru/uplcv?utm_term=pixel+gun+3d+modded+apk PDF link annotation
    • https://aspit.ro/imagini_ws/lukik.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/4686406461.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/63555257882.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/96104427400.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/20260459252.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/papuxig.pdfIn PDF document text
    • https://amgaa.org/temp/files/20157636825.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/59570204475.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///vemivugid.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/wuzedu.pdfIn PDF document text
    • http://benetalent.com/upload/files/47280904672.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/jajowidugexote.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/sovitufof.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/80914992343.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/87034770876.pdfIn PDF document text
    • http://skolky.info/foto/images/file/dumesolipisavap.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/77943628105.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/41190282040.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/gawozijexat.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/91185798522.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/16977416768.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/43047564368.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/45985239896.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210904111636.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/26269143250.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/jelegamatitexofiko.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133113204214---lazuvenawuraki.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_off0000e16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16A 10836 bytes
SHA-256: 765ff58d98a1c922370fe712d2da11b34b280b90cec3de622b5d4c34b3682047
font_01_sfnt_off0000fa31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11243 17012 bytes
SHA-256: 4ff575d110fb0af23ff19e5f70372dbb447127b388ba0a145264d413cb356d44