Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e9f46e30f741d4…

MALICIOUS

PDF

73.8 KB Created: 2020-12-22 09:29:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 2e1e6e2ad3f7bc4c425998fc0a6306f3 SHA-1: 15964322e3324c996bf62babb4728c18ae419c51 SHA-256: b5e9f46e30f741d4ad74aa50c96f40d9da01150b1842d50f09d483034c57aaf3
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 pointing to suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious redirection, potentially leading to further exploitation or credential harvesting.

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
  • 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://traffmen.ru/strik?utm_term=the+third+day+episode+3+ending+explained In PDF document text
    • https://xebikazogede.weebly.com/uploads/1/3/2/7/132740990/jafofabum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456121/normal_5fbef9871641b.pdfIn PDF document text
    • https://dakovogusuzulex.weebly.com/uploads/1/3/4/5/134595229/6977591.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369514/normal_5fc30de83e0b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405953/normal_5fa9217385827.pdfIn PDF document text
    • https://digagewopaloz.weebly.com/uploads/1/3/4/6/134634746/b957d09aba.pdfIn PDF document text
    • https://duzopotubesafes.weebly.com/uploads/1/3/4/8/134890215/jixopipi-zalos-bomevimazuge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5fafe6bee104a.pdfIn PDF document text
    • https://tiluzapibijodok.weebly.com/uploads/1/3/4/2/134265907/6b2353fff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378170/normal_5fb45bec2eab5.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/9c4b6d06-8013-40d5-9c1a-af2266b83cef/zisaferop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2babb5d3-7596-46bd-a9d6-0b6e5aa24337/autotune_baby_crying.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6744390a-1a36-452d-99ea-0ddc3fd88ad6/zofutulip.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_off0000e1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B8 5504 bytes
SHA-256: 5e883d41fa76d7df66d5d926cb26b7fee76b96c47cb8746b7b94ab90bbc7b340
font_01_sfnt_off0000f474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF474 11064 bytes
SHA-256: 3a8354f4f82f0d482f2ba1830eeea4e9e66107d1b5b72fc35729bddf139e10f1

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