Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff8a1dd24fece0f0…

MALICIOUS

PDF

73.3 KB Created: 2021-03-09 11:00:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4a9110c2d1c7814ba097543bfda30dc4 SHA-1: 2a8afdfd57aebe154eef6ff9d5b8606ed1c3dcd0 SHA-256: ff8a1dd24fece0f0002f98a6280a622b5fde4d509925f624581112b24e0159a2
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, with one pointing to 'bologen.ru', suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains text related to 'skewness calculation' and the authoring application 'wkhtmltopdf', which is often used to generate SEO-optimized PDFs that can be used for link farming or to disguise malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/award?keyword=skewness+calculation+pdf PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/retainer_invoice_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8f3d74d-2458-4bfb-8c03-ce4a1fde1143/ipod_classic_30gb_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/59162886944.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/sixub.pdfIn PDF document text
    • http://tazolupiviroliz.epizy.com/saeco_coffee_machine_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57ba35e6-a1b7-4c9f-8e20-8592a1a5ba44/38909298557.pdfIn PDF document text
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_931e1de90e4045629476f59422ee6a5c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdd9491e-96aa-4530-887e-a33bcf011d08/how_to_reset_ice_maker_on_maytag_refrigerator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fffd1b3-fa77-4426-b8f1-84ab45eee637/2013_lexus_es_300h_gas_mileage.pdfIn PDF document text
    • http://nanefelizili.epizy.com/71163683414.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3fc8b71-be2d-4262-9059-a0db6677aa59/jefujavebofizitew.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/find_control_in_listview_itemtemplate_c.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/39886605703.pdfIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/65833646616.pdfIn PDF document text
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_52df445942674372bb2cb35b59414f42.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b42c54f8-a282-4214-bca1-76d15f14dc6c/41501771913.pdfIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_e27f9d1c3aa84bf29b029ac6a0944694.pdf?index=trueIn PDF document text
    • http://wewixokadun.epizy.com/camozzi_pneumatic_cylinder_catalogue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88c6758b-2cf5-4bb7-b1e2-dcefe7e94886/redozilezunanodezujarofor.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/best_easton_arrows_for_hunting.pdfIn PDF document text
    • http://vujomafo.epizy.com/tepamogerojimadinal.pdfIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_b05df65c3a704f6eb4a22b79ba79a564.pdf?index=trueIn 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_off0000e2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A8 5312 bytes
SHA-256: 690103d4b1f077c27491eec44e299ca792312b65bf8548a3fafee7f7e137780d
font_01_sfnt_off0000f4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EB 10324 bytes
SHA-256: 5b2eb60e68ee607ef33c6ccadf39abaa4c2c4c9f4fd93b43701b50a51be0a8b2

Open this report in the interactive analyzer, or submit your own file for analysis.