Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b6cda945d428bd…

MALICIOUS

PDF

80.7 KB Created: 2021-02-25 04:36:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: a54e3207fc8f98a595cc9451089e019b SHA-1: 938a006eab2cff786a2628a1561bdad90ad55111 SHA-256: 35b6cda945d428bd5ddf46e44b0c431ce39d113d30cfed36d17160ab4d6d683d
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://crophysi.ru/123?utm_term=1.3+si+unit+conversion+extra+practice+answers'. This URL is presented within the document's body text, suggesting a phishing or social engineering attempt to trick the user into visiting a malicious site. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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/123?utm_term=1.3+si+unit+conversion+extra+practice+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4481055/normal_5fd8966c26398.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/tesodagiwor/puliluwupunoregoxivodaju.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/rusubefoxosal.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/worakunozogunub.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/pradhan_mantri_awas_yojana_2019_apply_form.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/97488602990.pdfIn PDF document text
    • http://jafimogapevov.rf.gd/chrome_plugin_to_video_from_website.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/issue_about_agrarian_reform_in_the_philippines.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/2244898743.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/85916408418.pdfIn PDF document text
    • http://tumoxotakim.epizy.com/fipijadolafonex.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_off0000fe2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2F 5268 bytes
SHA-256: 0ccbc0add384dffea8224104f5d3c6c85bc703619c973c97ee59e60353840e60
font_01_sfnt_off0001104c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104C 10948 bytes
SHA-256: dd3a0b43750df756c3c4160ba4b41d898664053cf135108ca403b2f39f0953c8

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