Malicious PDF — malware analysis report

Static analysis result for SHA-256 4973e6ea305756c3…

MALICIOUS

PDF

71.7 KB Created: 2021-09-18 03:34:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 421a669faa0fdd955ac6d255fde34d6e SHA-1: fdc65e566bf9b46575046b93406bd388db50860d SHA-256: 4973e6ea305756c32d46d69f60a6efa2ca9371ac4cf9d443f41828afc4c9737e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links point towards an attack pattern involving directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://thietbiotovn.com/Images_upload/files/78807435604.pdf In PDF document text
    • http://myslizdrave.com/soubory/tanezilufexavunak.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/69902235889.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/degomimisapipijon.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/13095184409.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/rexir.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/34076309096.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/98093793578.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/18368953971.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/37193544660.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/66740926088.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0c0243bc4---53331938240.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/8969938491.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/73694195346.pdfIn PDF document text
    • http://atek-ent.com/upload/file/viwutagepewej.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210913112013.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/lumufetobejutowup.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/nomubovavitewojujetomi.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137700c0a3ad---76103111398.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/17425705420.pdfIn PDF document text
    • https://vendax.ro/files/file/fazitel.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/56772359030.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/53293762736.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/xinawadisirovutopoladu.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/nidaditepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+block+caller+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_off0000b6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E5 10504 bytes
SHA-256: 9081e20f463f8d5276d93bf0098c586243b28b56b39621430e7f80d3d6dfd289
font_01_sfnt_off0000ceec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEC 16460 bytes
SHA-256: 873c75644c1dff6104443feb522488a87bbf680e3916ec594f4d450405e2ba97
font_02_sfnt_off0000f99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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