Malicious PDF — malware analysis report

Static analysis result for SHA-256 3912ef4bc0e308d5…

MALICIOUS

PDF

87.1 KB Created: 2021-09-09 07:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bff0f7c4ff95c01ee7be6a0cda440f8a SHA-1: f1e00f6e71d877c29c261bd6e83ba964005e6839 SHA-256: 3912ef4bc0e308d5e4a4881f07bfcf361a73b5fdbd0c784fc799be1a495a6fc3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated and appears to be generated content rather than user-readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cokhivietuc.webthoidai.com/img-vietuc/files/rubalodewugotokelepipoz.pdf
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/38766750399.pdf
    • http://riviera.az/userfiles/file/duvop.pdf
    • http://vodnik48.ru/content/file/zadunexorefoxumaduref.pdf
    • http://clinicaveterinariaalbese.eu/userfiles/files/vigatew.pdf
    • https://ottopianos.nl/files/46504183606.pdf
    • https://lean-ds.com/upload/editor/file/52617409219.pdf
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/68026533656.pdf
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/94462803929.pdf
    • http://regcureguide.com/files/files/29418578228.pdf
    • http://nazycakes.com/userfiles/file/sixalupizak.pdf
    • http://officinedesign.it/userfiles/files/xopanidazakojusejak.pdf
    • https://biocenfis.es/uploads/assets/file/gegasowamakot.pdf
    • http://puebloexec.com/userfiles/file/pujok.pdf
    • https://g4m3s-4p1-12s1.com/contents/files/70489261455.pdf
    • http://ageofwonders.buka.ru/sadm_files/pijesivasuni.pdf
    • http://peknanevesta.sk/media/file/visusidotofig.pdf
    • https://bestrecycledautoparts.net/images_i/file/39652276391.pdf
    • http://word.mn/uploads/assets/rozoketonimuvu.pdf
    • https://istruttorecinofilo.it/userfiles/file/22813663656.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ed07cad34---24690673930.pdf
    • https://nezrenweb.com/calisma2/files/uploads/91650544602.pdf
    • https://tw-itemaos.com/ckfinder/userfiles/files/69189401290.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=probability+random+variables+and+stochastic+processes+4th+edition+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000e99f.bin
6005739ce26c6c062429f1cdab8c5e2d0a689d551a70d10d3b21928b3681d2a3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE99F 17944 bytes
font_00_sfnt_off0000d18e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD18E 16792 bytes
font_02_sfnt_off0001059c.bin
04e0f3e9fe16617daad820428981989670e3022d396c45f9a9b2a67beb77ec3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1059C 11284 bytes
font_03_sfnt_off00011fbf.bin
76f38c9fb3c6e3481fc924a22429295dd9e4fc5372b38eebf00fcc402603a308		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBF 17744 bytes

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