Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f962d126c1e1beb…

MALICIOUS

PDF

77.8 KB Created: 2021-09-12 13:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b58e4a13c1cbad9d390fd01a8055e52 SHA-1: e6d85e9307e3e59f5d63cb426f672ad0594611f8 SHA-256: 2f962d126c1e1bebe83a445f20c4ac536e82deda9ea5a68d4567ed0a9ae17701
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://prograsifkalip.com/files/11124862433.pdf
    • https://dycmc.com/DATA/upload/files/202109050207301366.pdf
    • http://bualuang101.com/backoffice/upload/files/fafemejesusupunazolafato.pdf
    • http://kibbkw.com/uploads/file/32461770117.pdf
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/86690148701.pdf
    • https://htlexpress.com/ckfinder/userfiles/files/85636809890.pdf
    • http://burmeseburmilla-allevamento.com/userfiles/files/musabodopagevoge.pdf
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/30579149526.pdf
    • http://alacartedesign.de/userfiles/file/puzosasagilesi.pdf
    • http://kidneytracker.com/ckfinder/userfiles/files/masiwopimadi.pdf
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/5940332892.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6aaa3e9b7---femupefinemewot.pdf
    • https://ventadeterrenosagricolas.com/userfiles/file/bidibegolejevesibagu.pdf
    • http://igigeothermal.jp/userfiles/file/mufaxibevoturerimujokubow.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161348eba10ea0---xavuvawikemiwirubuma.pdf
    • http://tanabuauto.com/js/upload/files/75868527424.pdf
    • https://ecohort.info/userfiles/files/43501671938.pdf
    • http://turar-mussin.com/userfiles/File/turukis.pdf
    • http://austral-immo.com/userfiles/files/gunipasosiref.pdf
    • http://tuning-zone.eu/userfiles/file/60580454261.pdf
    • http://enkepharma.com/upload/files/94490847060.pdf
    • http://sukhonthip.com/file_media/file_image/file/goboremi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=forward+calls+to+voicemail+android
    • 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_off0000ce22.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE22 16792 bytes
font_01_sfnt_off0000e639.bin
abb36c4a9bef1a9ec0cecdef392cdff46899ba28024f40716ea15579d7c09d3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE639 10660 bytes
font_02_sfnt_off0000fea6.bin
234b45d6fd12c0447795d2745e12b72aadf809e5b0d3d1edbc27e3975deb08d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA6 16716 bytes

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