Malicious PDF — malware analysis report

Static analysis result for SHA-256 daae9d13d2192575…

MALICIOUS

PDF

76.8 KB Created: 2021-09-12 07:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 76f4e5dd6187af5b24efbbabc85fbc03 SHA-1: 1c06999be4f24107fc5e9a8b2c88e7540989bff6 SHA-256: daae9d13d21925752a08d2ddfb5002628f449702b63312f6919cb59c5b4e006c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. It contains numerous embedded URLs pointing to other PDF files hosted on various domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://hrudolf.com/userfiles/jenilozepifixuvumegop.pdf In PDF document text
    • http://cbcom.eu/ressource/site-image/files/vubel.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/76476938060.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/16445896136.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/16081730504.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/daleregemis.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/70674337360.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/82177755213.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/ropawufasurusotovuwovito.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613755c2c3057---84544360643.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///woneti.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/99669172559.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/89726871394.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/26527974952.pdfIn PDF document text
    • https://expomediainc.com/upload/file/59348290052.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/84520587384.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/4589262159.pdfIn PDF document text
    • http://szm.hu/userfiles/file/refedujunewatejalozepi.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/63987671295.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/laxubiduvoxofizemidasoxa.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16132b73f0fd41---puxaburepini.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/32824786705.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=super+mario+64+randomizer+downloadPDF 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_off0000c463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC463 18496 bytes
SHA-256: c04ad21fff6116485e5490c0d105f77315a28f2824cf12ed0c93b047f3eb4aaa
font_01_sfnt_off0000f49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB6 10856 bytes
SHA-256: faa7b90b01a0eb4ea9254faf5205f2ff56e424431a119a7cba64ca6757d23494

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