Malicious PDF — malware analysis report

Static analysis result for SHA-256 52cf7dadb8b5da5c…

MALICIOUS

PDF

81.5 KB Created: 2021-05-29 23:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 753a6aca620f2cc78522b2ffb3f55f59 SHA-1: c6551b82d45a40a861915d36f6273d4c24c412a9 SHA-256: 52cf7dadb8b5da5cdc6d60c62a78d821581b22761d5cd1a9856f873587d6cfc0
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. One of these URLs, https://lozipotod.ru/strik?utm_term=cuando+se+considera+fiebre+en+un+adulto+covid, is directly embedded in the document's content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/strik?utm_term=cuando+se+considera+fiebre+en+un+adulto+covid PDF link annotation
    • https://lafotavesa.weebly.com/uploads/1/3/4/6/134633764/d649db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416506/normal_6018dad708b8f.pdfIn PDF document text
    • https://ropababiw.weebly.com/uploads/1/3/4/6/134667017/fifaduzifenof-lurijopen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375070/normal_6064145055b46.pdfIn PDF document text
    • https://dutatofe.weebly.com/uploads/1/3/4/4/134471766/f788d4e7cd45.pdfIn PDF document text
    • https://rituzanasalu.weebly.com/uploads/1/3/4/7/134718781/6530387.pdfIn PDF document text
    • https://fusemikak.weebly.com/uploads/1/3/4/6/134649426/zojarara.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/774eb120-251f-4506-9fa7-cd3e9106121c/nufeje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dcbb434-75d0-475f-83a7-74ccb0b5dba2/how_to_take_apart_a_winchester_model_94.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6e82274-0c64-4bf6-a71a-d2af142912b1/what_techniques_are_used_to_gather_data.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad36d85e-8f68-42c3-8bf5-2e9da8bca6d0/in_search_of_respect_full_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e701fa6-0e1f-4c10-a615-2bfc07a2366a/12074547866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20d8c5f7-4ccf-42f8-b670-b7a3d388e6e2/53455533417.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13cc2773-72b4-43a7-aa6a-96a8348d8e4c/95499166069.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ddc9b2e-384c-42b1-90d9-94c6cbff57eb/teaching_english_as_a_second_language_tafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67d29f04-5614-4c95-aabf-fc229dc6eaa5/how_to_reset_jbl_flip_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/214be172-0a83-4010-b96c-d34b63f8a3ba/haier_window_air_conditioner_5000_btu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e800b71-de16-4455-8271-cacb8a046e4a/mumawivawosiba.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_off0000ff5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5C 5120 bytes
SHA-256: 59d40a8615c6fb0a94d062c56e0acc051b4df1e9980ae4c03f4d205c02a585a7
font_01_sfnt_off000110d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D9 11656 bytes
SHA-256: c3dba7ac36aaf3dad40268fb8d0779c5b0d2683116b3d27f9a4b074a214c6e01

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