Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e38f36338a5039b…

MALICIOUS

PDF

87.0 KB Created: 2021-04-04 09:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ce9c55e15b17c00eb5a45dea83834c8 SHA-1: e34c659a932ddf472cd86a57039c988a0e6e5c12 SHA-256: 5e38f36338a5039b5273210efdba8c1c523abd5feb40dafe8bee5500cf45115c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pointing to 30 external PDFs. The primary malicious URL identified is https://mezovuduw.ru/award, which is likely used for phishing or to serve further malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/award?keyword=aparato+digestivo+embriologia+pdf
    • https://vonipelimodaro.weebly.com/uploads/1/3/0/7/130738487/besemegosageg.pdf
    • https://cdn-cms.f-static.net/uploads/4365602/normal_5fe6a380dfa6d.pdf
    • http://tefitagesev.mypressonline.com/angular_2_tutorial_typescript.pdf
    • https://rexizoxulod.weebly.com/uploads/1/3/5/3/135399206/levanifotujab.pdf
    • http://sagunutu.medianewsonline.com/boxing_training_workouts.pdf
    • https://cdn-cms.f-static.net/uploads/4378852/normal_5fd10968b1bae.pdf
    • https://lavabowigu.weebly.com/uploads/1/3/2/6/132682694/e87156873f9.pdf
    • https://cdn-cms.f-static.net/uploads/4370076/normal_6027aee76d701.pdf
    • https://cdn-cms.f-static.net/uploads/4366668/normal_60692589be682.pdf
    • https://static.s123-cdn-static.com/uploads/4450340/normal_5ff417a05fe21.pdf
    • https://tijogarukaro.weebly.com/uploads/1/3/4/7/134710746/zuvof.pdf
    • https://rudunusom.weebly.com/uploads/1/3/4/6/134602981/levagipijit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4d9b7eb2-3fc1-4d57-8215-4f22f45b154f/cnn_world_news_today_live.pdf
    • https://uploads.strikinglycdn.com/files/204820ba-d418-4f2d-9375-4c490f460203/nifuf.pdf
    • https://uploads.strikinglycdn.com/files/e49e4056-fafd-43b7-9869-4b9743a69e58/perfect_aire_dehumidifier_p2_error.pdf
    • https://587b455d-cc79-4428-8e80-a8b75ce23bca.filesusr.com/ugd/021ec8_ffccbcdc9e7a477f9979bda238c5b99c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ae4461cc-13f9-4826-ad79-7dfcdf8f5d93/gonomexidibo.pdf
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_a1514526ea5e4fa5af979115f29866e3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/02fd526e-dd1b-4c8e-ac3c-62100d787b39/21312682373.pdf
    • https://uploads.strikinglycdn.com/files/92fe6c4a-08e9-495a-8bdc-4d64cab0c2b9/furodaguditabalobuwu.pdf
    • https://944456f3-75eb-4cd6-bbfd-656b3713ada1.filesusr.com/ugd/2c8d66_8d1a2f8a35cf467081c1cf2e398915de.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5fa6fddc-02c6-4169-be84-31ef853d3b30/84880254637.pdf
    • https://uploads.strikinglycdn.com/files/bff04109-7806-4248-add6-1f9cd58f4f0e/gonididorese.pdf
    • https://uploads.strikinglycdn.com/files/b54e63c1-990e-4d6b-8640-017e524a3903/22249039016.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://scripts.sil.org/OFL
    • 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_off00010084.bin
6eeeec2ed7d0e00088885e8d3a60574cf7914c3401f24f82b26dfbb5ffe8e96d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10084 5548 bytes
font_01_sfnt_off00011351.bin
18a4b45bcb41351e67784dc1e3591bbd1d159ea68d32fd1609f338b7e6df1730		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11351 11492 bytes
font_02_sfnt_off000138ce.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138CE 16204 bytes

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