Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e1a9d16bee3e99…

MALICIOUS

PDF

84.3 KB Created: 2021-09-20 03:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5567995298b5429b1c74a86c3c938473 SHA-1: d0097b111d0c6246519b20b65fcd93c087b64542 SHA-256: a3e1a9d16bee3e99855e30af8d08c8180871e70f232286ce0ce6e6200099e185
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with many pointing to unknown or potentially malicious domains, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the overall structure and heuristic firings point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://fcvperu.org/data/fcvperu/userfiles/file/fojemixukano.pdf In PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/bigivovefexasepivajek.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/81690398452.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/15691348402.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/73034316837.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/tixirojefi.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/kimujug.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/85519120490.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/tasakimitod.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614442ecaec51---pebipojitosanajen.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/90054649912.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/23699765075.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/90110286059.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/fujaxabugapulopex.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/xedegevaparajama.pdfIn PDF document text
    • http://gewald.ru/content/Files/jetofifaxapojotikifo.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161454193739b1---forivorilopowufuju.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/55502748237.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/dupafuzozigi.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/zezigu.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/garafemekemazupamekapof.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/50465911927.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/77365440244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=android+mac+changer+appPDF 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_off0000e4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE2 18140 bytes
SHA-256: eb1a20dee0e95f0e32348e1becf4c2316e41305cfb0f2a4f749f34f7e22eb936
font_02_sfnt_off00012c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1E 10628 bytes
SHA-256: e0065d20e52f05c87fe7374cd0f39cfdf08b1574f0f03bfe6495a6d87864d1a5

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