Malicious PDF — malware analysis report

Static analysis result for SHA-256 539e758cb4921b79…

MALICIOUS

PDF

77.8 KB Created: 2021-03-31 07:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4bf74a3c13688f14fd4d4cd4c55f8e82 SHA-1: baba54833ecbc402a8d31a830997f6360be520d6 SHA-256: 539e758cb4921b795b18c169f53a05823a86748ae74bd014584418f987d673e7
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/wix?keyword=s+block+elements+notes'. This indicates the document is designed to redirect users to potentially harmful content. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of malicious URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/wix?keyword=s+block+elements+notes
    • http://faxusigeroles.sportsontheweb.net/64805673936.pdf
    • http://lakuberik.mywebcommunity.org/ip_access_control_system.pdf
    • https://static.s123-cdn-static.com/uploads/4404308/normal_5ffe196f3b809.pdf
    • https://cdn-cms.f-static.net/uploads/4366035/normal_6014c177ee741.pdf
    • http://zomolejefej.mywebcommunity.org/96748113661.pdf
    • http://nipijapogila.sportsontheweb.net/94522027407.pdf
    • http://sutovuresas.mygamesonline.org/should_a_single_man_buy_a_house.pdf
    • https://static.s123-cdn-static.com/uploads/4369317/normal_5fff2399ee5d8.pdf
    • https://cdn.sqhk.co/saligoliti/jcmWqhb/85046253463.pdf
    • https://cdn.sqhk.co/wukorovev/gMjitvD/apocalypse_now_movie_dual_audio.pdf
    • http://zanodopowe.sportsontheweb.net/agama_sikhisme.pdf
    • https://cdn.sqhk.co/vuwibagula/hBLobhi/xidibesibuwapirofugo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tebuwawezizafes.onlinewebshop.net/what_essential_oil_kills_foot_fungus.pdf
    • https://s3.amazonaws.com/zubuwujoxom/95073452532.pdf
    • http://sawesupunozigiv.atwebpages.com/toxoplasmosis_tratamiento.pdf
    • https://s3.amazonaws.com/fatisake/jukabikedove.pdf
    • http://woxesizefibugel.atwebpages.com/adding_and_subtracting_integers_word_problems_with_answers.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2c5.bin
116354614b0011ed6f23d8f8b076ce79d28ba9f7cb3f30a384043b69dd4c3e06
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C5 4948 bytes
font_01_sfnt_off0001038f.bin
800c5568fb318b9e4b4cd117aabb12bb3c177e9ce27fd971de5f4533ae3b75b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1038F 11316 bytes