Malicious PDF — malware analysis report

Static analysis result for SHA-256 26b6d07e541f860f…

MALICIOUS

PDF

75.9 KB Created: 2021-06-08 16:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 21a72d2b4be97d0001d7e8f46e293784 SHA-1: 3e87647837d6efef43368648c3d51032931c686b SHA-256: 26b6d07e541f860f976e87f1097cdfdb9e858c6dc151bac10f7a9b52406e6e21
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings reveal it functions as a link farm, containing numerous external URIs pointing to various domains, likely to distribute phishing content or further malware. The presence of many external links on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://coretry.ru/pbw?utm_term=the+midnight+sun+pdf PDF link annotation
    • https://nizidisifa.weebly.com/uploads/1/3/4/5/134505067/1650858.pdfIn PDF document text
    • https://josozigigararu.weebly.com/uploads/1/3/2/6/132681886/2540048.pdfIn PDF document text
    • https://kepoxenuranejes.weebly.com/uploads/1/3/4/3/134396716/tukijobugafi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374848/normal_5fcc2628f0358.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496204/normal_6059f079a3cbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476270/normal_602fdb0fe926e.pdfIn PDF document text
    • https://gazezujebek.weebly.com/uploads/1/3/4/8/134881616/de52018f23f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369926/normal_5fd1505c3837a.pdfIn PDF document text
    • https://wutikivefuripiz.weebly.com/uploads/1/3/4/6/134662644/7ccb9b92bd7a.pdfIn PDF document text
    • https://dadizatutelebi.weebly.com/uploads/1/3/1/0/131070904/januvijereneduw_sotanene.pdfIn PDF document text
    • https://tugixafebav.weebly.com/uploads/1/3/2/6/132681891/simimalovuwo-noxez-rakavivabunegob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490140/normal_60421f70c28ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464077/normal_5fcc8f7872693.pdfIn PDF document text
    • https://xovelojedawoka.weebly.com/uploads/1/3/4/6/134662979/38522926.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475383/normal_601f25e75c843.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365613/normal_602faac7ae52f.pdfIn PDF document text
    • https://pemimitajeli.weebly.com/uploads/1/3/0/7/130739011/7680489.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461777/normal_5fdd18a023c7d.pdfIn PDF document text
    • https://gaxizizobepebi.weebly.com/uploads/1/3/0/7/130740618/2f81c04c1c1d23.pdfIn PDF document text
    • https://zavewixesareput.weebly.com/uploads/1/3/4/8/134855174/0aaa724bd1b65.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62F 5064 bytes
SHA-256: 3ca55ae65586f4e8275ee2e5be3a8a6c762a11cff26887a2eb7c4419e7564f41
font_01_sfnt_off0000f74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74F 12572 bytes
SHA-256: d0dfa67ca9787f6dddc55e375c1aaf67c4e36726b018e0856221b8d75a8de6bd