Malicious PDF — malware analysis report

Static analysis result for SHA-256 6daff6ec39aac5d4…

MALICIOUS

PDF

77.3 KB Created: 2021-09-14 08:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 26864430917089a6e671cfc5ab427688 SHA-1: 8ecc332c65f8234b6fbf4f51133282d4d59f8696 SHA-256: 6daff6ec39aac5d455a212c07a0197f9ce30fcd87e1198216c449f0de0960ee4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to suspicious domains, and one heuristic identified it as a link farm on disposable hosting. The primary function appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://studiotecnicomartani.eu/userfiles/files/zajopedumulawisizaxot.pdf In PDF document text
    • http://etalentlink.com/uploadfile/file///2021090914275526.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/46154327920.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/59828917330.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/nusejitunezefonidege.pdfIn PDF document text
    • https://maurinet.com/userfiles/file/zujuxurokixisadume.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136052a1cd90---xifawujijigeto.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/kukipu.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/risoji.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/tidozofudinuzasufuzinu.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/kidojiwixexonemedu.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210904003053.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/37485027083.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/porume.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/95162363541.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/52234865867.pdfIn PDF document text
    • http://erimti.com/userfiles/file/60284767782.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/10726795146.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/4160301469.pdfIn PDF document text
    • http://upakuika.com/img/file/93294203303.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/parobogodatibiguw.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/pivupu.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/latazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=minecraft+pe+0.15+0+apk+free+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_off0000c7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C0 17476 bytes
SHA-256: 30fd4a6e187f3549e6c643cfa088ddb9d21e56e45f448b8aafeed01b85e24f17
font_01_sfnt_off0000f537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF537 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4E 10988 bytes
SHA-256: 449a2569baf358edf294231b8b0609e84f81c9bec7ed7019f771a79c084f095c

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