Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac12deb6ff654fe…

MALICIOUS

PDF

77.6 KB Created: 2021-09-26 01:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ad881e0694537bdd81902612cc758f1d SHA-1: e5d60103cc12c1fc0562fcd2134eb3c8e31b7c13 SHA-256: 6ac12deb6ff654fe623018aea5caad7c58b5e79cbe9acab9c7e2e27300dd67b4
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. It contains numerous external URIs, suggesting it functions as a link farm or redirection mechanism to potentially malicious sites. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports its role in directing users to external content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://bigcool.net/webroot/img/files/57759994887.pdf In PDF document text
    • https://martas.vodrsport.cz/uploads/files/vuzivaborupopa.pdfIn PDF document text
    • http://stl-hk.net/userfiles/62989026876.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84280053525.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/domanukewuwezaxog.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/zekuranisa.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/nazidodatusuramalavoxisuk.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/gurogabelovijanopazoko.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140cd6fdbabc---4840878609.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/wewamezegilupeve.pdfIn PDF document text
    • https://voxel-avocats.fr/uploads/file/In PDF document text
    • http://ck-buhgalter.ru/userfiles/file/61843896352.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/75860572890.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/39878941477.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/vizoraponenuzixefizid.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/vodixudifibipokowawakuf.pdfIn PDF document text
    • https://lesura.net/userfiles/file/92566996738.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/lujax.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/nogupamidok.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/vepute.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/22951591980.pdfIn PDF document text
    • https://ywint.com/ckfinder/userfiles/files/1631959870.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/vifim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=poco+x3+antutu+benchmark+scorePDF 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://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_off0000cb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE367 19060 bytes
SHA-256: 6dd33fe37c7166534238363d05e69bc024e3b46c8bba383c8b793f5516137969
font_02_sfnt_off000114eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EB 10964 bytes
SHA-256: 38ec7007d9229755fc3c9a7e4fcd569233c69b954719f690909adcf7f493d351

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