Malicious PDF — malware analysis report

Static analysis result for SHA-256 95a7259bd199139d…

MALICIOUS

PDF

86.1 KB Created: 2021-09-12 11:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2270cb996b9d5cfbd95c600f2a645e55 SHA-1: 052363db9598f2e82ed814529a8bbc46eb364b7b SHA-256: 95a7259bd199139d6f0cce03da08641d96d9be3a6aeb2f6ec0f406bf56e194d5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded links, many pointing to disposable domains, suggesting a link farm or phishing campaign. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://asztalosweb.hu/userfiles/file/37415688750.pdf In PDF document text
    • http://dongduong.net/Images_upload/files/29390946585.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/guwinixesudaxo.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/12390660613.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/105059548.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/51732628305.pdfIn PDF document text
    • https://diphong.com/uploads/62554955413.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/697155967.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/0ia6a9i9t1h3c6pmi33uli3jl5/gajugezerogagafuraxojiv.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/40273209147.pdfIn PDF document text
    • https://spyboarcams.com/files/fiwanupilevedunevibefus.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/mupuxeviv.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135c14f97adc---39076751912.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1630838870.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/12068416510.pdfIn PDF document text
    • http://zubrcup.by/files/files/20659437098.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/rufawepasowutokin.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/4859195576.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/dafatuxizadudajobemi.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/tijatikizujopim.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/fewugun.pdfIn PDF document text
    • https://ms2oke.com/contents/files/bujovufigoxon.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/69341454932.pdfIn PDF document text
    • https://virker-ikke.dk/files/19940019318.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/60281974389.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=shadow+fight+2+mod+iphonePDF 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_off0000e812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE812 18908 bytes
SHA-256: daa384b3c89fd7c3e4d0260c249f30a13301c020d43f255410e8b50d58112f36
font_01_sfnt_off000119e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E4 10912 bytes
SHA-256: dc27ce665e886dd13d0863aaade20a3e0d25cd31f96886c8af6eb2486dd3fa47
font_02_sfnt_off000132e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1