Malicious PDF — malware analysis report

Static analysis result for SHA-256 475857ec6f172b69…

MALICIOUS

PDF

77.6 KB Created: 2021-06-05 04:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9716c4ff2bb75a1b80a013f9f795a0c SHA-1: ebc7ed380bd85d5b281943aac3c61b0ece9cccbc SHA-256: 475857ec6f172b6971db1c78f6b1088a691eb3a2c8f4daa8b54e54897e9082fc
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. The primary URL, https://medvor.ru/pbw?utm_term=dr+caroline+leaf+think+learn+succeed+pdf, is likely a lure to a phishing or malware distribution site. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9132

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://medvor.ru/pbw?utm_term=dr+caroline+leaf+think+learn+succeed+pdf
    • https://cdn-cms.f-static.net/uploads/4489593/normal_5fe72fb2b9daa.pdf
    • https://lugigotaxur.weebly.com/uploads/1/3/0/9/130969655/792561.pdf
    • https://cdn-cms.f-static.net/uploads/4408197/normal_606a1a21dc2f7.pdf
    • https://rakuwogu.weebly.com/uploads/1/3/4/8/134858672/kaluwet-zaxoxekivo-duvex-peviwiwobosanu.pdf
    • https://kogimejazasopuj.weebly.com/uploads/1/3/4/7/134713999/bakovan.pdf
    • https://pununoruvok.weebly.com/uploads/1/3/4/6/134693134/9932291.pdf
    • https://cdn-cms.f-static.net/uploads/4383322/normal_600dc4d565807.pdf
    • https://rurujopolobadez.weebly.com/uploads/1/3/4/4/134444805/88665.pdf
    • https://cdn-cms.f-static.net/uploads/4467950/normal_6011702cc0dfc.pdf
    • https://natulawud.weebly.com/uploads/1/3/4/3/134309077/38a252d715f2e4.pdf
    • https://sinijeba.weebly.com/uploads/1/3/5/3/135329812/petukagudofom.pdf
    • https://ninadagonalot.weebly.com/uploads/1/3/4/6/134668818/1453937.pdf
    • https://xizuxikeg.weebly.com/uploads/1/3/0/7/130740292/7252773.pdf
    • https://wipomozexabezi.weebly.com/uploads/1/3/0/7/130776841/7302414.pdf
    • https://static.s123-cdn-static.com/uploads/4376101/normal_6001f83fd228c.pdf
    • https://tufutitos.weebly.com/uploads/1/3/4/4/134491926/padubajuvil.pdf
    • https://rudiduwusoxu.weebly.com/uploads/1/3/4/4/134445317/zopokikojajexemidipi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/1dc57da9-6fd9-4f27-abe9-7e4eed15c1fb/tekla_structures_modeling_manual.pdf
    • https://uploads.strikinglycdn.com/files/981bb7b4-1abd-4061-8b78-5edb5bfeb81a/msp_hack_password_generator.pdf
    • https://uploads.strikinglycdn.com/files/07dc6dfd-3d00-4619-b6eb-42a848f5373a/hoover_widepath_tempo_no_suction.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f02c.bin
e5275bb099082af643ab94b715947b92045f71b4aa17887e10f2bb26cdb5b2ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF02C 5188 bytes
font_01_sfnt_off000101c1.bin
94edc66f8ff2806e4f793efc7c55fd7fa029016fd5a00d1f11e6d404c9a05ee9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101C1 10432 bytes
font_02_sfnt_off0001253d.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1253D 4324 bytes

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