Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4c84e768875a90…

MALICIOUS

PDF

106.3 KB Created: 2021-03-27 15:43:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d132b403a00413e1b2b3e57b101af0e SHA-1: dd7e38f9460ef5da9aad2fc7a19eb56ff886c30e SHA-256: ca4c84e768875a9055d667419a42ef3c520523369eb9d99a54e1bc73a0e3250e
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. ClamAV detection and ML classification further support its malicious nature. While no scripts were directly extracted, the structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/strik?utm_term=kenwood+ddx419btm+review
    • https://cdn.sqhk.co/xogutozo/xibjjLE/city_car_driver_mod_apk_unlimited_money.pdf
    • https://cdn.sqhk.co/zifiguwosu/jgfkiIB/jefegagirafi.pdf
    • https://cdn.sqhk.co/vibisimak/idhghgY/kujolunozi.pdf
    • https://cdn.sqhk.co/leburogutu/S98Usip/smart_goals_nursing_student.pdf
    • http://zotonurapad.22web.org/mitosis_vs_meiosis_worksheet_middle_school.pdf
    • https://cdn.sqhk.co/mowukirew/Ihcihge/65712835736.pdf
    • http://lojapidabud.mypressonline.com/97555107179.pdf
    • https://cdn.sqhk.co/lagusive/jcwfjjM/english_song_lyrics_for_whatsapp_status.pdf
    • http://najetaxu.mygamesonline.org/laxosivarusakuvikeg.pdf
    • https://cdn.sqhk.co/zizaratijiga/1hjmujg/jiwetagejilewilita.pdf
    • https://cdn.sqhk.co/tuponapalab/jk5jchd/vogolasogexunivomolezes.pdf
    • https://cdn.sqhk.co/zegareguw/jhhdicW/70682728356.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/538e4bf2-f5ef-49eb-af6a-c98e92d26ead/zedoranud.pdf
    • https://uploads.strikinglycdn.com/files/be5ebd9a-3b7b-4b4c-aa41-d41bd4c018dd/kemufeketuzuxezevunusav.pdf
    • http://vekejuf.atwebpages.com/54813871543.pdf
    • http://gonesipida.epizy.com/psychopathologie_de_l_anorexie_mentale.pdf
    • http://vexolofifete.atwebpages.com/tomoe_butterfly_valve.pdf
    • https://36efb8dc-095d-4108-9d27-edb6d2dc3bbf.filesusr.com/ugd/54fa57_f1a554fbb62c4aa0a8f74113715cf7e4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c5572260-7da1-4369-b1e5-f309a3be842a/programmable_logic_controllers_an_emphasis_on_design_and_application.pdf
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_b9ab13ae00b641dd97b1f8817ef53116.pdf?index=true
    • 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_off0001621f.bin
b0df4c3ff93c32513e88ebd262c58711a379d1f4038310b64b6fd70c73e2c5aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1621F 5176 bytes
font_01_sfnt_off000173d1.bin
8e2d4630974b1cf076d85cf6d450ad30b31fa48f9a34908919d1e88dd4459754		 pdf-font-stream PDF embedded font (sfnt) at offset 0x173D1 11620 bytes

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