Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1c55afd737a1dd8…

MALICIOUS

PDF

71.1 KB Created: 2021-09-27 14:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ed55b43006f3f88a5655235d249ec69 SHA-1: 59d1d9793bdd3ceb78f117bf3d1ec197cbdb7ff4 SHA-256: d1c55afd737a1dd852cf90c69d39d83239e3526321d54b1c13700c844ecb14df
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs and the link farm heuristic suggest an intent to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://3e3i.com/UserFiles/file///jusalagaxevapumoj.pdf
    • http://pfollowers.com/ci/userfiles/files/kurisavevifimowutasavo.pdf
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/kudele.pdf
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zezakutowibeviginekaba.pdf
    • http://bestorkate.com/uploads/ckeditor/files/25884381398.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614afdcf39726---64297139332.pdf
    • http://dejede.com/userfiles/file/80535914910.pdf
    • http://kahounova.cz/userfiles/file/89071433737.pdf
    • https://agentcctv.com/userfiles/file/ziwavekesimanesekunawatof.pdf
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jifavubamodesesatusi.pdf
    • http://draftingfloorplan.com/ckfinder/userfiles/files/27996025578.pdf
    • http://budapesticukraszdak.hu/userfiles/files/duxewixipazikolomuvaba.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/8f6e2523af8469d41cda487af71ca61a/zupasas.pdf
    • http://xahuaheng.cn/userfiles/file/nagamatirozedosidufanami.pdf
    • http://ondamarinarest.com/upload/files/kuxalotidisi.pdf
    • https://happycolaborativo.com/uploads/files/88539449087.pdf
    • http://emailreceptionist.net/userfiles/file/38472828683.pdf
    • http://location-appartement-venise.com/italie_documents/files/lufizuzufi.pdf
    • http://medicare-darmstadt.de/bilder/UserImages/file/bunoxofevarixitugix.pdf
    • https://coonvalleycc.com/userfiles/file/visige.pdf
    • https://eyetracking.pl/userfiles/file/wasodow.pdf
    • http://psn-monolit.ru/img_file/files/17769242372.pdf
    • http://stattus.com/assets/file/72041932717.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=android+bitmap+rotate
    • 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_off0000b2e9.bin
bf8f316b91886dee6d2901517dcc256343da7764d1a4fd4fa46f803a904a8196		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E9 17496 bytes
font_01_sfnt_off0000df66.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF66 16792 bytes
font_02_sfnt_off0000f77d.bin
98229b625b58252eb4a2c6832fe0a8c91a2895a620a1e881f08123bb406ffa36		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF77D 10460 bytes

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