Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e70ea796c2f0cc…

MALICIOUS

PDF

69.1 KB Created: 2021-06-12 00:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8ee5f7789d7e71296f7e9261d07402f SHA-1: 678ed046c4960f5bd75daa1fafe3d7cc40e344ae SHA-256: 31e70ea796c2f0cc76dfad78336c0b4bd08ab92dc9c7a1dd1fc7aa42627754e6
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including ClamAV and an ML classifier. It contains a large number of external links, suggesting a link farm or phishing attempt. The primary URL, https://smidgel.ru/pbw?utm_term=20+free+followers+instagram+trial, appears to be part of a lure to drive traffic to potentially malicious content hosted on various platforms like Weebly and s123-cdn-static.com.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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://smidgel.ru/pbw?utm_term=20+free+followers+instagram+trial
    • https://motawifuliwax.weebly.com/uploads/1/3/3/9/133999363/nutuliz.pdf
    • https://static.s123-cdn-static.com/uploads/4386349/normal_5fcfa394e1cb5.pdf
    • https://kuginipa.weebly.com/uploads/1/3/4/8/134853520/jepawuz.pdf
    • https://static.s123-cdn-static.com/uploads/4484610/normal_5fe279b067466.pdf
    • https://static.s123-cdn-static.com/uploads/4484370/normal_5ffe0bcc18b21.pdf
    • https://static.s123-cdn-static.com/uploads/4368758/normal_5fedc8278a8a8.pdf
    • https://veguxalefimas.weebly.com/uploads/1/3/1/3/131382166/xewim_pewetofe.pdf
    • https://cdn-cms.f-static.net/uploads/4412378/normal_6009d72ca5678.pdf
    • https://bagerukuvimi.weebly.com/uploads/1/3/2/8/132815916/5456567.pdf
    • https://static.s123-cdn-static.com/uploads/4370088/normal_5ff6afe23fae9.pdf
    • https://cdn-cms.f-static.net/uploads/4368496/normal_60622e1f2dc4c.pdf
    • https://wufunuxiropid.weebly.com/uploads/1/3/2/7/132712508/fisimugixawafegapuf.pdf
    • https://static.s123-cdn-static.com/uploads/4369163/normal_5ff7c68b69b4b.pdf
    • https://cdn-cms.f-static.net/uploads/4480174/normal_5fda6d4c323b8.pdf
    • https://cdn-cms.f-static.net/uploads/4387821/normal_6018c3d1cf828.pdf
    • https://cdn-cms.f-static.net/uploads/4383464/normal_6014a0a304289.pdf
    • https://toripifisesu.weebly.com/uploads/1/3/4/3/134367164/6147605.pdf
    • https://cdn-cms.f-static.net/uploads/4501804/normal_603ee783b08a2.pdf
    • https://static.s123-cdn-static.com/uploads/4489257/normal_5fcbdf5ee43d0.pdf
    • https://static.s123-cdn-static.com/uploads/4500438/normal_5ff7776ed8e4f.pdf
    • https://sepiboberad.weebly.com/uploads/1/3/1/1/131164555/356365.pdf
    • https://judunuxazivu.weebly.com/uploads/1/3/1/4/131453245/sujujoxole.pdf
    • https://static.s123-cdn-static.com/uploads/4416149/normal_5fcdae3a13253.pdf
    • https://cdn-cms.f-static.net/uploads/4460233/normal_6028f1d0cc4df.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0d1.bin
880317b942fc60e1eaa46171d3b74205bdab49ae2a37c8466fe283438fd8e278
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D1 5356 bytes
font_01_sfnt_off0000e305.bin
69191b7b9515e5ec6011fbdd07fa791cf9a54333fc8c8af5b4fd6e9394fe81cc
pdf-font-stream PDF embedded font (sfnt) at offset 0xE305 9976 bytes