Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81e2289b23c8a90…

MALICIOUS

PDF

73.0 KB Created: 2021-01-01 00:32:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 2dc763a48487740db82a6319112f73cb SHA-1: 148f624d9e4116ae128e1b7c9c126d1948f98463 SHA-256: a81e2289b23c8a90eeaf320db897352edb874e1875b025beb49c5b7732487b52
214 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The embedded URL 'https://traffmen.ru/123?utm_term=world+war+z+read+online' is identified as a known malicious redirector. Additionally, the PDF contains a large number of external links, with 'https://s3.amazonaws.com/xurixado/vemaminolirisomabimonewuf.pdf' being one example, suggesting a link farm intended to distribute further malicious content or engage in SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffmen.ru/123?utm_term=world+war+z+read+online In PDF document text
    • https://tizitumobupo.weebly.com/uploads/1/3/4/9/134904485/fewitep.pdfIn PDF document text
    • https://xegejibizagufom.weebly.com/uploads/1/3/4/8/134851168/vibomibexekogu.pdfIn PDF document text
    • https://cdn.sqhk.co/keliziniw/cYpnjiD/top_scorer_serie_a_2017_18.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/xurixado/vemaminolirisomabimonewuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5de617d-b4a4-4bb6-be0a-7716930be0c7/sutajofarepalibevotituk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a58c15a3-9052-412b-8e83-b89d66969f96/tekudovazisojo.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/finuxufokodirurofakusere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5aac4b9-351d-4014-98a7-4f5972d8ed3b/gadido.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1846a16a-1c7b-4e4b-9a1c-bc9176bee8e8/55734971969.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/zogufudobujigizak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c297275e-d7d5-4550-9404-461bba5747bb/92940699814.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b0dbc9b-d7ad-46d6-8b71-abccbe85d27f/88824008224.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_off0000e402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE402 4796 bytes
SHA-256: c3172f24df8b599d73896759155005e3be4a7918a37f2e47ca0290f5014a7960
font_01_sfnt_off0000f47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47B 10276 bytes
SHA-256: 36965eef6e7771dc9526fff164a9c91d905da18719754d23dc3b1f1486d95ea0

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