Malicious PDF — malware analysis report

Static analysis result for SHA-256 f912b6dae3c37dde…

MALICIOUS

PDF

86.4 KB Created: 2021-05-23 04:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 63bd60e4a9d515d8cdf6e17fe7f3fccc SHA-1: 66262446cf5a2666c3a183ea4fb5b02c7876b283 SHA-256: f912b6dae3c37ddee2897ac4d4b8a853f093167064e920fdf539eedd383cb56e
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The embedded URLs and the nature of the link farm heuristic point towards an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/strik?utm_term=misal+diario+pan+de+la+palabra+octubre+2020 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374189/normal_600907039ab75.pdfIn PDF document text
    • https://dozogifelezu.weebly.com/uploads/1/3/4/3/134313369/8f21be1.pdfIn PDF document text
    • https://lapobozitex.weebly.com/uploads/1/3/5/3/135305834/dd560484ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417221/normal_6005f70e76143.pdfIn PDF document text
    • https://sexeduju.weebly.com/uploads/1/3/5/3/135327292/mekuzul_figusagomilowim_xuvuda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416929/normal_6059475b3b098.pdfIn PDF document text
    • https://daxekofaji.weebly.com/uploads/1/3/1/6/131606395/5605308.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505102/normal_5fd7370f42547.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385863/normal_606a2bce98c3d.pdfIn PDF document text
    • https://vugogirofezufus.weebly.com/uploads/1/3/4/3/134355312/3681149e047f.pdfIn PDF document text
    • https://biwawidojimu.weebly.com/uploads/1/3/4/6/134648839/6e4818f87928e2e.pdfIn PDF document text
    • https://fewewoxeluvatu.weebly.com/uploads/1/3/4/3/134338934/kodemigituwiwaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475988/normal_6046965f3bed0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373985/normal_60499fffdb4ce.pdfIn PDF document text
    • https://gonotelavekufuf.weebly.com/uploads/1/3/4/6/134615299/5bb2fa9c.pdfIn PDF document text
    • https://netulomite.weebly.com/uploads/1/3/2/8/132814473/4659584.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/jefomulax.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/78843634561.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/gettysburg_licensed_battlefield_guide_names.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3E 5368 bytes
SHA-256: b113c0a66df491250b23bf02bfcca709cd4cbf8a696a6938c0a393fab955145e
font_01_sfnt_off0000fe77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE77 5560 bytes
SHA-256: 0e0271f4c2c57dbcf6ca140af57fb1a9a75f9ab6aef06835d28bb7caa4319395
font_02_sfnt_off00011287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11287 12616 bytes
SHA-256: 7051bdf35803f144d718ab09cc7a3f356e5b3f02a01dd8d7c85f8e61601dd60e
font_03_sfnt_off00013b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B99 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34