Malicious PDF — malware analysis report

Static analysis result for SHA-256 7879efdacd1d79ec…

MALICIOUS

PDF

72.0 KB Created: 2021-09-18 08:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: fd3ca5e98f3c5df80c08cf6f6a4ce4cd SHA-1: 8987be66602ea9e192ff678de05ce4f87f9ad9a9 SHA-256: 7879efdacd1d79ec69ec627d1baf876680252f471d7f03d8471f30334f2dc49a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm on disposable hosting, with numerous embedded URIs pointing to external sites. While no scripts were extracted, the structure and embedded links suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://coretry.ru/uplcv?utm_term=redmi+note+7+locked+mi+account PDF link annotation
    • http://energy-labels.com/userfiles/file/puvofijogaper.pdfIn PDF document text
    • http://geodez.com/pliki/file/20277498180.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/liweki.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210904155257.pdfIn PDF document text
    • https://people11people.gr/uploads/File/vurofulejoxaxowumewufi.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/71112665253.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/97810683581.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/370543562.pdfIn PDF document text
    • http://minipit.com/data/files/mazularas.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57792196137.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/wegububosibagolomori.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210911114516.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613320b70ddf8---35345622382.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/76099261052.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/lojutiroxiwuba.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/41622764591.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/tuvazikajudogoxujij.pdfIn PDF document text
    • 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_off0000b19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19A 10552 bytes
SHA-256: 800a1c9fa4b06c554ebc6d1460a4d35724c78e1ec3db53ca59785c49865b03a4
font_01_sfnt_off0000c9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C4 18672 bytes
SHA-256: 11a394c96cbf58edd8f8060aedeedd5a0bb440050c3d61575ced74e00eab9743

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