Malicious PDF — malware analysis report

Static analysis result for SHA-256 081c824ac1736a26…

MALICIOUS

PDF

66.2 KB Created: 2020-11-23 13:45:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 933577dd99694397efffbc5c5b5d446b SHA-1: 8ee659c7a7de33221f7afd1445ed808c5e135023 SHA-256: 081c824ac1736a26fbfb9444f71816065a6eb212c5a1a09dabf71dc4e03b542a
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting an attempt to drive traffic to potentially malicious or spam-related content. The ClamAV detection and ML classifier further support the malicious nature of this document.

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
  • 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://traffking.ru/strik?utm_term=tippmann+a5+response+trigger In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368751/normal_5fa3733a7b6de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403406/normal_5f91f8224e8b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389582/normal_5fab5edb36498.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/454c3812bf78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378836/normal_5f91ed1d409f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445880/normal_5fafa0ed249d0.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/sasufufa/pasofolesedokosativa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01cb6854-702c-4e95-8272-1bb8c7e77a60/81493993385.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f199d8ec-408a-494c-89be-098fa041ea6f/23388830874.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/tiligixanobisadavomi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b79fea1-bb6f-46f2-a778-a8900c234e5b/xavap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b655d75c-8148-43a5-87d1-e5873597919c/Kostenlose_inlndische_spanking_Gesc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/546c5977-cd08-438b-b037-37c1413ed6a7/tutowotuxilomifeju.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_off0000c586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC586 5180 bytes
SHA-256: 7aa630ca2afb922aa4f639c02ff9790870be8ceef069549bb9ff9223b3ed97c0
font_01_sfnt_off0000d70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70A 11096 bytes
SHA-256: bb40ac75875e33612e01904842f2a743f23d62eb30cb706ad3ef04f9c453b42a

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