Malicious PDF — malware analysis report

Static analysis result for SHA-256 5423699a4e50ac1a…

MALICIOUS

PDF

76.3 KB Created: 2021-03-04 23:45:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: ecc0b6416dde3a85b6feabfafaf2ad34 SHA-1: 5ef9a67db762bc95defdca4330f9dd1ab3789aa2 SHA-256: 5423699a4e50ac1a9adfc48b70c8232c7feb15f61950fb251fc4ceac0640509e
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirectors or potentially malicious domains, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The primary malicious URL identified is dafemum.ru. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

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
  • 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.
  • 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.
  • 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://dafemum.ru/123?utm_term=how+much+do+black+and+white+copies+cost+at+fedex In PDF document text
    • https://static.s123-cdn-static.com/uploads/4379603/normal_5ff5e6c87ac85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393488/normal_6005fe1d4a462.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408004/normal_6018e039b1e82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370555/normal_5fec3091af388.pdfIn PDF document text
    • https://sirowatogiwu.weebly.com/uploads/1/3/2/8/132814809/48d979f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485162/normal_601bcc17bada7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369142/normal_5fdafdb0a4d04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425483/normal_6032fa0b99f42.pdfIn PDF document text
    • https://dilasakezonaxos.weebly.com/uploads/1/3/0/7/130775260/sukuk.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/f4d8a554-8603-47e3-97fc-c691521f5fe0/6042948516.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9725df2-18d4-47d5-909b-accb60c52f59/what_inspires_you_to_do_your_best_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23f3ab21-666d-4f3e-b70e-885f48c273a8/what_is_the_4_digit_code_for_philips_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d7cb954-552d-4ab7-940c-428a66936f4f/sevaxipevuzelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8021d5eb-dd9f-4dcb-ada9-fd9958aa118f/autocad_student_download_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b878d9c-0d86-4e7d-97ab-3540711cffff/mosoxusiwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b682d2a-f2b6-4455-9f42-55393d5cc9f2/common_mistakes_in_spelling_words.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7e59291-3a2b-4b03-8c78-9eb146bf3b1f/how_to_program_uv-5r_with_chirp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d04e4903-2fbb-4015-9f0e-a641d49b827b/mojagasuma.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_off0000eb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB99 5624 bytes
SHA-256: 60947785e68c7cd28565013ebcb39a08cc8231f37ef9b8e89fa69f1e42f082a6
font_01_sfnt_off0000fea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA8 11144 bytes
SHA-256: 6eefef9bb9c46cb8e8dc989b892a7298829c79bcd9411c198d30db851fd49d15

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