Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfeb073d87b7df82…

MALICIOUS

PDF

74.1 KB Created: 2020-12-18 02:23:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 30311d50363e904367ca848eeac726f3 SHA-1: d773cfc047268692d04893a01d173846ec760a50 SHA-256: cfeb073d87b7df82de8e1e1966cc60d454290ffed94cf7ebd8ea86268932b8f3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and contains metadata related to PDF generation tools rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://gettraff.ru/aws?utm_term=xamarin+android+action+bar+height In PDF document text
    • https://cdn-cms.f-static.net/uploads/4418972/normal_5fb2b3fe74a77.pdfIn PDF document text
    • https://kobenavu.weebly.com/uploads/1/3/4/7/134714827/272653aebc8.pdfIn PDF document text
    • https://rupugafes.weebly.com/uploads/1/3/4/8/134847604/seferazade.pdfIn PDF document text
    • https://wilubowedawiwo.weebly.com/uploads/1/3/4/5/134528918/takemavigexori.pdfIn PDF document text
    • https://puliwavigajog.weebly.com/uploads/1/3/4/4/134469254/6fabaa1c.pdfIn PDF document text
    • https://xexidizufom.weebly.com/uploads/1/3/4/5/134508107/5743818.pdfIn PDF document text
    • https://terarawuterojuz.weebly.com/uploads/1/3/0/7/130739827/pesovof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428342/normal_5f9ebfd392b35.pdfIn PDF document text
    • https://debovibeki.weebly.com/uploads/1/3/4/7/134715081/vizewa.pdfIn PDF document text
    • https://ranemexamegen.weebly.com/uploads/1/3/4/4/134440137/7685657.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd004cdae50a014587c172/1606221902666/fiveridizoxunaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fcffb0a-9dcb-4246-8d8c-12edfeda180a/13_things_mentally_strong_dont_do_p.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5066e104edf1d779b9afc/t/5fc913d6af8c606fec6a6113/1607013334931/38122153221.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a870262-73c6-4ba3-b540-185911ed0610/medical_certificate_format_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB29 5260 bytes
SHA-256: 511ed9c89a72606d20ea6dadfd94d4ee623a7148640862357b0dbde4890f8539
font_01_sfnt_off0000ecd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD3 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off0000f561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF561 10964 bytes
SHA-256: b05c1ec9e896807acf694d7f2580099a3558dcf0287311316eb216e0b48ae9f2

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