Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39f8ede050852a0…

MALICIOUS

PDF

70.3 KB Created: 2021-02-14 17:41:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: dd385d0086f15828433c3361640833ab SHA-1: 131a849b43ce7ad8ae8155aa971e28d95f53ee96 SHA-256: c39f8ede050852a0a1c1b574d33ff0fe539a0b87d15bd0e9d8effb1304b2b366
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with the primary URL being a lure for 'Spanish adjectives worksheet answers'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or SEO poisoning tactic. ClamAV and ML classification confirm the malicious nature of the PDF, likely a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://maypoin.ru/wix?keyword=spanish+adjectives+worksheet+answers PDF link annotation
    • https://teniroge.weebly.com/uploads/1/3/4/6/134693228/sezopan-zovosiruziso-pibisifizaja.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/Y8iehPs/download_no_crop_and_square_for_instagram_apk.pdfIn PDF document text
    • http://zebrait.fun/thermodynamics_in_materials_science_dehoff_solutionsjekxa.pdfIn PDF document text
    • http://sks-expertiza.ru/wapowiwibulasedekluzt.pdfIn PDF document text
    • https://cdn.sqhk.co/navuwamas/jhidgco/cafe_racer_bike_parts_in_karachi.pdfIn PDF document text
    • http://kernig.online/kick_the_buddy_2_mod_gamerc54b.pdfIn PDF document text
    • http://omshop.space/55623379049swhhb.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/gcrheha/68172234528.pdfIn PDF document text
    • https://cdn.sqhk.co/wolebiduju/jcgcUOy/tosuja.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/damerirazib/first_article_inspection_report_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/hd_blue_blur_background.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/76256511327.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/40931622508.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/ais_calling_melody_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/cholesteryl_chloroformate_synthesis.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/93949470200.pdfIn PDF document text
    • https://s3.amazonaws.com/farokof/44445550854.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/report_phishing_to_apple_support.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/gatoguwezudupikose.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_off0000d44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44E 5524 bytes
SHA-256: 98c004e056c24eaeb0c930abea08178c7dceaa2575b351e9c9d71cb7fcf01847
font_01_sfnt_off0000e726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE726 10692 bytes
SHA-256: 27af7df4f4613df01abf4f44a3116833ab2e2fd4aff97ffd672d4bf148a8bdf1

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