Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dbafef0799cd769…

MALICIOUS

PDF

65.3 KB Created: 2020-11-26 01:47:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4d3b2abd32dcf81cfc960580d2d94da2 SHA-1: 2877595bfab3a592fb07d15f84ab332309a44179 SHA-256: 8dbafef0799cd76965eec2922b97a972ef321d6305b68873b1c9cbf045df9880
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The embedded URLs, such as 'https://traffset.ru/strik?utm_term=blue+velvet+shrimp+vs+blue+dream', suggest a phishing or malicious redirection attempt. While no scripts were explicitly extracted, the nature of the PDF and the heuristics strongly indicate a malicious intent to redirect users to potentially harmful sites.

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://traffset.ru/strik?utm_term=blue+velvet+shrimp+vs+blue+dream PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379856/normal_5fbbed792df46.pdfIn PDF document text
    • https://jiraxoxaxizare.weebly.com/uploads/1/3/4/0/134012395/lijatut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391621/normal_5f97921b09144.pdfIn PDF document text
    • https://rufonezovudut.weebly.com/uploads/1/3/4/8/134854931/wakulogota.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422136/normal_5fbc9e8e35b37.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/latufenaw/53078575116.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/66826699710.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/confederate_vs_union_army_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fafb3de-4280-4abe-99a1-4f4211eccd4b/change_of_base_formula_to_evaluate_log.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/free_facebook_proxy_sites_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68488b2f-540f-469f-a74d-eb99f4c677cf/mark_klimek_notes_download.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/fundamental_beliefs_of_a_muslim.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_off0000c428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC428 5448 bytes
SHA-256: e0375b1311231188148ccc78b4df31ac19912460f4df05128a9a3429c2e83f4f
font_01_sfnt_off0000d67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67E 10028 bytes
SHA-256: 46a54603ba57e6618024679f6047d86576e8ae100e6996e264e6cacbf5a739ef

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