Malicious PDF — malware analysis report

Static analysis result for SHA-256 a451b837336df026…

MALICIOUS

PDF

68.0 KB Created: 2021-09-27 15:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e7e4735a2612ab807a4fd13a1ed0a0d SHA-1: f0feb0f2487a3ca19772148fe4b69168b23e4b5e SHA-256: a451b837336df026e722c748f948d1d040956d4943d722d258d3be9549d734d4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded JavaScript and is flagged as a phishing lure due to its small size and image-only content, typical of a screenshot used to hide clickable elements. The document body is heavily obfuscated, but the presence of JavaScript and numerous external URIs suggests an attempt to redirect the user to malicious sites for credential harvesting or further payload delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://bawauang.com/contents/files/7453551974.pdf
    • http://yangs-ns.com/ckfinder/userfiles/files/20210905121600.pdf
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sakoximosolamizet.pdf
    • https://bunianco.com/other_files/File/fisobotaxeloled.pdf
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/56986747481.pdf
    • https://nmcs.ca/userfiles/files/bulur.pdf
    • https://vico-immobilien.com/ckfinder/userfiles/files/81614206817.pdf
    • https://ipekyolumedya.com/resim_galeri/file/88038148713.pdf
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/sokugesuvitod.pdf
    • https://pacantioquia.org/aym_image/files/nixererofozuk.pdf
    • http://teplo76.ru/uploads/file/36749088945.pdf
    • http://novosib-sport.ru/ckfinder/userfiles/files/duronemamiwabusumato.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b6cc4475d---92559359864.pdf
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/6053536655.pdf
    • https://hamzsabegi60szallo.hu/UserFiles/File/34557783247.pdf
    • http://nsfeed.com/_UploadFile/Images/file/70774220014.pdf
    • http://ryukatsu.com/userData/board/file/96322856441.pdf
    • http://ajej.pretty-match.com/upload/files/juguwepokek.pdf
    • http://ihanzao.com/userfiles/file/20210926162144_375449558.pdf
    • http://marcth.pl/media/fck/file/zuluvat.pdf
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/pijegezexevosesurav.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/fa40bbed23a8384fdd154c597e3945f0/sozebozilataxibezujotege.pdf
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/xarusoxanumejowuzamefiten.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=cruella+2021+torrent
    • 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_off0000adc5.bin
ea5e146b94b7cb65bf5ebf2090263f0c88d41356c3d28c0aec26b8d7e858d4ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADC5 14560 bytes
font_01_sfnt_off0000d1f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F5 16792 bytes
font_02_sfnt_off0000ea0c.bin
9708e83851d22a983caa4e58e07ebb00a87015179564ef3550a222c8c79cffcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0C 10268 bytes

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