Malicious PDF — malware analysis report

Static analysis result for SHA-256 506d989bbbcfcb09…

MALICIOUS

PDF

78.5 KB Created: 2021-05-19 12:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ca51bbec4397d1d58dbf21d547a75a6f SHA-1: 270525559ec1e03b04ee8e71caec6c9be03e3c9c SHA-256: 506d989bbbcfcb09518f4104f84c86c13ffd904cd53434d560915b0e555b92fd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point toStrikingly-hosted PDFs with generic titles, suggesting a link farm or SEO manipulation tactic. One of the external URIs, 'https://zajinet.ru/strik?utm_term=mapa+conceptual+de+los+mecanismos+de+transporte+de+la+membrana+celular', is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

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://zajinet.ru/strik?utm_term=mapa+conceptual+de+los+mecanismos+de+transporte+de+la+membrana+celular PDF link annotation
    • https://pesaladijij.weebly.com/uploads/1/3/1/3/131382382/5f2d475a537.pdfIn PDF document text
    • https://bijawodit.weebly.com/uploads/1/3/4/8/134883407/kasirame.pdfIn PDF document text
    • https://gejejemimegi.weebly.com/uploads/1/3/4/8/134899280/rugazunos_mudawirenemo_kapimaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/46fad695-26ed-43df-8d11-00607f67f936/what_is_the_meaning_of_the_word_career_development.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77a862e1-e71b-4d29-86f9-e07ae45a47e8/20322633543.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/825030ea-2bb2-4e86-83eb-af3f5eac48a2/dozidarafudebogupodiba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7b93f50-c1e0-41b2-b9d1-0ea844169bf7/58982118837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26199865-b41f-468a-8566-83987a08d197/poulan_pro_5020_factory_carb_settings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1210354-d050-4591-a8c1-30b2b9c7fe84/toro_824_snowblower_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49f0116c-2cb0-4eec-af91-115abb0a05cf/80044655596.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2058c1a-41c0-4357-8be7-88486fd142b9/jijovitebajoxobekovu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37948287-e519-46bf-8472-babb8f09abab/best_echo_book_for_cardiology_fellows.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72d8a95d-7ce8-4127-83c5-b87b9a614be7/12935352169.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/73508958133.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/how_the_spanish_flu_was_controlled.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/leatherworking_guide_1-_300_vanilla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/248679c1-f16a-4ec3-a881-0b9b43fcc89c/total_quality_management_strategy_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84e84fbe-3bef-4eab-9480-77a05d6beeb4/92859837215.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a60e7103-3f9e-4452-b2b7-601062b9d1af/tagoxixelabobajojif.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/nulizi.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_off0000f297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF297 5364 bytes
SHA-256: 46265d66e9cfdfad72c79dc8b823d2993a2b0e709d351e0c56d56166fff3abff
font_01_sfnt_off000104bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BB 12080 bytes
SHA-256: 2acf651b4c9c866bf3d4e6f9f7f82c64af79d7076947f7da9c80b63cc98b0fe7

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