Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d5e7c7eea35d775…

MALICIOUS

PDF

61.3 KB Created: 2020-12-14 07:03:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 085f748e4ec01ed954ac2125ad0fe444 SHA-1: b928d6d0b612c0d9b734f36ece16e0a3ab565c8a SHA-256: 9d5e7c7eea35d7750a525c9ec1b168fde87e41aa110432a2fa5d9ad4c58a7b81
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'El camino real library', likely intended to trick users into clicking the malicious links.

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
  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffmen.ru/strik?utm_term=el+camino+real+library In PDF document text
    • https://cdn-cms.f-static.net/uploads/4470209/normal_5fa9cd5d4ca6b.pdfIn PDF document text
    • https://ramogowerutamu.weebly.com/uploads/1/3/4/4/134488443/4d8ad9851cce.pdfIn PDF document text
    • https://rugazodexozapef.weebly.com/uploads/1/3/4/4/134480570/2425231.pdfIn PDF document text
    • https://koludoselutak.weebly.com/uploads/1/3/4/8/134893798/jojuw-siwafe-zasub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366362/normal_5f87dead82f99.pdfIn PDF document text
    • https://komuwewolidixat.weebly.com/uploads/1/3/4/8/134871085/goxiwumojukujumu.pdfIn PDF document text
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/e8631.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/43cc2bf4-2297-43e8-9de8-dffc5a760725/survival_of_the_sickest_chapter_2_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/810b8881-a429-4b7d-8429-7a0b62fcf288/10223944092.pdfIn PDF document text
    • https://s3.amazonaws.com/waxejajinigafu/73895678620.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/xulegadiseguxodir.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_off0000b122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB122 4964 bytes
SHA-256: 13b643220cfef42916d5e5316ab293c51bbb4a57093c7c5e8dece95f4eb50d55
font_01_sfnt_off0000c1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FB 11536 bytes
SHA-256: cc730a9778c4c46505e34800ccde93dcb8d9cd9e6f1fb8dc82a0e1be2c99af25

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