Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c947b427ad41c2…

MALICIOUS

PDF

71.8 KB Created: 2021-09-10 22:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a59b9c1988779f92ac88ee80f23944b4 SHA-1: 81bcbbb6178ebe3c4e0185f948101e6b60503ffb SHA-256: e1c947b427ad41c2b696c2251ad0c706b83b36aef00261e9211548c08c830473
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and numerous extracted URLs suggest the document functions as a link farm, likely to lure users to phishing sites or download further malware. No scripts were extracted, and the document body was unreadable, but the presence of multiple external URIs points to a redirection-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd89ca6353---vazuxisunolamavidibu.pdf In PDF document text
    • http://olynskiconstruction.com/pics/file/tapegameguz.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/jamamogon.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/75890660052.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/88188081636.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/20474932690.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/lasegedawod.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/50696140829.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/lelikojupi.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/rutenoliv.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/59064958542.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/32101769103.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/94943185113.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bovad.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/202192147288070.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/5478875446.pdfIn PDF document text
    • http://ashokarefrigeration.com/userfiles/file/zipotixozos.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/xiweleregibixikomudoma.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/gelajuzevusokunijimiluka.pdfIn PDF document text
    • http://polletnv.be/uploads/files/81892645467.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/nujexirizurumefo.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fffa02cd1---93407981757.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/49498107322.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/fibuf.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/bitavegal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=head+soccer+flashPDF 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_off0000b96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB96A 16228 bytes
SHA-256: 0748c39914dfa10a859866f7a631f9563668de3177b6327764ac697a31af3236
font_01_sfnt_off0000e2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE4 10268 bytes
SHA-256: e401aeb0d505a95f99d54bf0d408f63866dabb023930c61e848b8b02869fc779