Malicious PDF — malware analysis report

Static analysis result for SHA-256 901b0760f63615e7…

MALICIOUS

PDF

74.3 KB Created: 2021-02-04 07:15:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7b440801bd874f99a21c235129923791 SHA-1: ef14e0cff2fecd425dd55beffaa3f2f1940d5f31 SHA-256: 901b0760f63615e713885cca603114544da9283f788900ef1b84fdd2df652adf
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically indicating it contains malicious redirector links and suspicious lures. The embedded URLs, such as 'https://crophysi.ru/aws?utm_term=standard+deviation+google+sheets+graph' and 'http://securitycheckingbrowservkcom.xyz/914274528399c5wh.pdf', are likely used to direct users to phishing sites or download further malicious content. The ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://crophysi.ru/aws?utm_term=standard+deviation+google+sheets+graph In PDF document text
    • https://sijalafad.weebly.com/uploads/1/3/4/8/134887162/8679913.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480886/normal_5febc217bab7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488817/normal_5fcc8d8e0f7f0.pdfIn PDF document text
    • https://cdn.sqhk.co/filomada/kdhc2ia/21828472204.pdfIn PDF document text
    • http://cactusvpn.live/simple_birthday_cake_decoration_ideas_at_home5ofph.pdfIn PDF document text
    • http://filmera.ru/table_top_dirt_bike_jumps8cigj.pdfIn PDF document text
    • http://securitycheckingbrowservkcom.xyz/914274528399c5wh.pdfIn PDF document text
    • http://llloooodddd.space/44008717944b331y.pdfIn PDF document text
    • https://bugajujifupub.weebly.com/uploads/1/3/4/8/134894919/sogar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368996/normal_5fefa8f20d369.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450434/normal_5ffdc663b9a47.pdfIn PDF document text
    • https://cdn.sqhk.co/dodiniwotud/1hiErrr/pubg_game_recorder_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467561/normal_6014d36ab0ebf.pdfIn PDF document text
    • http://fruit-ital.space/descargar_mala_mujer_noemi_casquethm7ys.pdfIn PDF document text
    • https://dubiriji.weebly.com/uploads/1/3/1/4/131406762/jubuzot.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/mitavakijezaru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xomepixo/performance_appraisal_template_example.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/84473878329.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/spotify_for_windows_offline_installer.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FE 5384 bytes
SHA-256: d56cec943be7f94e3e166f937c88e5a9351dffbb30eddbfd53230021196bbf24
font_01_sfnt_off0000f74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74A 10628 bytes
SHA-256: 1f99f497228d376c7ed4ac89c419ab1858577d3bec503f7e8be638ad5fafe88d

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