Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff7d7743293f93f…

MALICIOUS

PDF

75.0 KB Created: 2021-02-15 16:26:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7ab1384d0d05b5e867b9483682631f38 SHA-1: 3ecf75f420f8352f7b258258983a5b26c655b6fe SHA-256: aff7d7743293f93ff4a6fbf3870f7e227355608142323d326bb307252b157a94
154 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The embedded URL `https://crophysi.ru/wb?keyword=how%20much%20do%20petroleum%20engineers%20earn%20in%20nigeria` is designed to lure users into clicking, likely leading to a phishing or malware download site. The ML classifier and ClamAV detection further support its malicious nature, indicating it's a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wb?keyword=how%20much%20do%20petroleum%20engineers%20earn%20in%20nigeria In PDF document text
    • https://cdn.sqhk.co/nejajevafode/jdIjbgh/freeze_dried_raw_food_for_dogs_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/gomiwopizi/hjRxw43/virus_scan_for_iphone_11.pdfIn PDF document text
    • http://sakipewo.22web.org/band_of_brothers_stephen_ambrose_epub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408873/normal_5fcabda68868a.pdfIn PDF document text
    • http://piguzipudoval.iblogger.org/realtor_magazine_franchise_report.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425511/normal_5fc6c7da87c83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459645/normal_601f9b2c8735a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379237/normal_5ffcbea940964.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393626/normal_60252bfabe7af.pdfIn PDF document text
    • https://cdn.sqhk.co/wovovoteg/a9q81hc/geopolymer_solutions_cold_fusion_concrete.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/jcghVid/sawudegudil.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/fihojft/melodyne_download_full.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460450/normal_5ffb8848ce9dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449184/normal_600d058d665b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385202/normal_5fff2492da12d.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/gewuwasi/50493812389.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_off0000e82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82E 5540 bytes
SHA-256: 5708750a7c570ebc10d6434dba4e6ab25439357d429635879f591a402cc0d87c
font_01_sfnt_off0000faec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEC 10388 bytes
SHA-256: c34b169b7357f2415d3971a778d3b86cab4ad0267bd19086138f452c62ab0534

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