Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73b4474ffd6d0e0…

MALICIOUS

PDF

123.0 KB Created: 2021-09-14 11:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35a39d4220fc8fa7353c5fce5ead1fc7 SHA-1: 335649da552950290807097915ed27858414217f SHA-256: a73b4474ffd6d0e07fa6a4c4a16987be53b86e01814126b316d30bfd8343e5b7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to disposable domains, a characteristic of link farms used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL distribution suggest a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://shian-jin.com/UserFiles/files/15182031635.pdf
    • http://electric-kernbichler.at/99607447860.pdf
    • http://kantoromega.pl/userfiles/file/93589085030.pdf
    • http://garmaclima.com/uploads/ckfinder/files/vexunuz.pdf
    • http://nousgarage.com/userfiles/file/fixokejekaxalum.pdf
    • https://transmilenio.net/datamont/userfiles/file/84371676428.pdf
    • http://usairsprings.com/userfiles/file/64713675954.pdf
    • http://klhl.com/userfiles/file/vudupagepunexobe.pdf
    • https://worldpigment.com/image/upload/File/3237393393.pdf
    • http://ambulatorioveterinariomariani.it/userfiles/files/7450563331.pdf
    • http://liderzy.natura2000.pl/imgturysta/files/82662882940.pdf
    • http://eastcity.hu/ufiles/file/33718330097.pdf
    • https://coolinterier.sk/upload/files/nitajusafewira.pdf
    • http://lednotice.com/userData/board/file/vumoripujonurutonimem.pdf
    • http://evola.it/userfiles/files/daxowujifejepalowinava.pdf
    • http://studiotecnicostradi.eu/userfiles/files/76547157663.pdf
    • http://cesvil.it/filesUploads/file/79462128279.pdf
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/3386754977.pdf
    • https://alpinashop.rudy-ra.com/files/sazafusilanufenajune.pdf
    • http://diysmart.net/userfiles/file/satukevemed.pdf
    • https://chuyennhakienvangvn.net/upload/files/seruvipugokapoxuwonido.pdf
    • http://volareinmongolfiera.it/userfiles/files/disujakitufigur.pdf
    • http://theclelandgroup.com/img/upload/file/48875014008.pdf
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/81357735166.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=the+gospel+of+barnabas+text+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000179fb.bin
d420d9fff70b2973f845c90a4cf6065436e6e4335b03e1cd46bf9df884027e7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x179FB 19416 bytes
font_01_sfnt_off0001acfd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACFD 16792 bytes
font_02_sfnt_off0001c514.bin
25a46efdb97dc265e9ebcd3cbcacf1bd84e80720b9a657eeb6f658e07d394524		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C514 10892 bytes

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