Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a990fbaabc36de…

MALICIOUS

PDF

129.1 KB Created: 2020-11-22 08:09:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b14124403bc1e214f95918b17fc424c3 SHA-1: 14200cb6697db2f2f371d4a2f8aee91e8465cbde SHA-256: 92a990fbaabc36de7c86e6dc46e8c88ca37ff6c4a5ea123cfde55cbbe62e1fa3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, suggesting a link farm or redirection to malicious sites. One of the primary URLs extracted is 'https://traffnew.ru/123?utm_term=huck+finn+from+the+adventures+of+tom+sawyer+worksheet+answers', which is likely used to distribute a second-stage payload or phish for credentials. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/123?utm_term=huck+finn+from+the+adventures+of+tom+sawyer+worksheet+answers
    • https://cdn-cms.f-static.net/uploads/4382793/normal_5f8b669b7095c.pdf
    • https://cdn-cms.f-static.net/uploads/4365649/normal_5f876061a7cfa.pdf
    • https://cdn-cms.f-static.net/uploads/4444366/normal_5f9d85a9d8041.pdf
    • https://cdn-cms.f-static.net/uploads/4449987/normal_5fb7365b4da58.pdf
    • https://xopavomubikun.weebly.com/uploads/1/3/4/8/134879687/lelifoxamufitutuguz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/88d1b8ed-7102-442b-a9bf-d22388409984/21406351041.pdf
    • https://uploads.strikinglycdn.com/files/2f3559c0-06e7-41ad-b954-f97aaee84b9a/skull_bones_study_guide.pdf
    • https://uploads.strikinglycdn.com/files/196d3ed3-f296-474c-98fa-580f68b16ee5/figijadanawanarexu.pdf
    • https://uploads.strikinglycdn.com/files/a0e92a17-4e3e-4ffa-b080-240594669f7b/xipadimosimegetijidobigob.pdf
    • https://uploads.strikinglycdn.com/files/64854495-308f-4045-8335-1658b53eaa24/32796397959.pdf
    • https://uploads.strikinglycdn.com/files/282ac3af-5a73-4166-ab73-78fdd8c87b7a/xezetipukapuga.pdf
    • https://uploads.strikinglycdn.com/files/301c7416-d102-4d45-9dd2-7a56b8a2e4ac/68857315282.pdf
    • https://uploads.strikinglycdn.com/files/a82e48cf-4db7-4f55-a100-916e87c48004/jsk_studio_hentai.pdf
    • https://uploads.strikinglycdn.com/files/dda2505a-3052-47ff-a717-42f721805fcc/lawubobupokiz.pdf
    • https://uploads.strikinglycdn.com/files/0d2db198-6d48-4a0b-9af9-8368907ef120/80451202360.pdf
    • 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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b11b.bin
c8f01e46ea39dfea9f0a62b742dc3fa8a12241ba82cbcf7cf1e7f15a76a7ff95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B11B 5508 bytes
font_01_sfnt_off0001c3c4.bin
a7c194c348f4bc26aad06ae1fa1eadf76503a3aca856ff80314c3d87a816eea9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C3C4 3720 bytes
font_02_sfnt_off0001cf24.bin
6a0aa3c8c58d2be8f8a3a1e934309f206f1c045bbb994320b18d2339634e8e78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF24 11388 bytes

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