Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace64f1eab77ef2e…

MALICIOUS

PDF

72.2 KB Created: 2021-09-28 00:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 53dbb2a5493c087bb911ad05ab2e8873 SHA-1: ef772b924ee438ed996d1a20eb34c06afd627648 SHA-256: ace64f1eab77ef2e0ec9de03483b9736ec5f0b82e9795636fc3606e8409c866f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed as a link farm on disposable hosting, pointing to multiple unknown URLs. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm nature strongly indicate an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/g9aa2p2c7ubs39huiuf7rk1gj3/sivururevozaf.pdf In PDF document text
    • https://cpsguffanti.com/uploads/file/80562688832.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/nomimisoturorujikuwigusi.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/20420105172.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/29870526194.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/makokolasakulew.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/32037286337.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/sidelojuxi.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/birodufazisepugovex.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/xixitupumupazu.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/jefilalaviver.pdfIn PDF document text
    • http://apsons.eu/files/file/46853709041.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/wuwexarizonugoj.pdfIn PDF document text
    • http://brushes.tfe-design.dk/userfiles/file/soguturozijib.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/24317590083.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/tizojivipi.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/86257135609.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/50997794161.pdfIn PDF document text
    • https://miet.hu/kepek/leseviluj.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/xapevidaw.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16140497b4d7ab---xarejazexovivoku.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///85825838229.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/fowonamarutefaranep.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/femupeg.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/pumogusebajapenarox.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091917263751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=video+editor+app+with+lyricsPDF link annotation
    • 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_off0000b620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB620 10676 bytes
SHA-256: c2343c7ed4a4c82d157cad0745fcd0493faa9129746acb977ede999dadc0e537
font_01_sfnt_off0000cec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC8 17296 bytes
SHA-256: 1a1bba8db655e8caa41902208836927b937cc918fc476f90b3ef089e06061c48
font_02_sfnt_off0000fb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1