Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a4d2ea0e45da89a…

MALICIOUS

PDF

84.5 KB Created: 2021-09-16 10:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3c564dc81f51f632f900d4c8a99d31c2 SHA-1: cc98bd505441b8938d1c81c8e092e92996a36da4 SHA-256: 2a4d2ea0e45da89a6b42edf2ee7ee5f861d2fa5275ddf5ada121971e29241077
134 Risk Score

Malware Insights

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

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, many of which point to disposable domains and are part of a link farm, suggesting a phishing or redirection scheme. The heuristic 'SE_URGENCY_LURE' also indicates the document may employ deceptive tactics to prompt user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://bezagsecurity.cz/userfiles/78558797012.pdf In PDF document text
    • http://plaschke-partner.com/uploaded/file/88979309230.pdfIn PDF document text
    • http://myredm.ru/uploads/file/felozaga.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/72152588626.pdfIn PDF document text
    • http://atrsara.ir/resource/files/pazuruvoraj.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/radojafomatuzedu.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/66478928416.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/jitixufovivaligis.pdfIn PDF document text
    • https://masukpt2.com/contents/files/vowedubobores.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/gokavejametizote.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/72061965410.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/77188226612.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/87736125699.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/91110195733.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/69769811815.pdfIn PDF document text
    • http://yanartextil.com/firma/files/84311041782.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/83118544968.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/12503101071.pdfIn PDF document text
    • http://signauction.net/userfiles/file/jenimonewagovupi.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/46755511193.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/64474892891.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/pegewilomejapope.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/43292277300.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/65677615103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+call+protect+on+androidPDF 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_off0000e165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE165 10604 bytes
SHA-256: 51724d749f1ba5c9bb7503decf3def3758e7292dabdd0e5e7739ce372953b376
font_01_sfnt_off0000f991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF991 19732 bytes
SHA-256: 54a4b594899f05ddd439cdc2771a62c3629da6a919596a7e851528cc69669c6a
font_02_sfnt_off00012c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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