Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3fdc18591ae6a20…

MALICIOUS

PDF

73.9 KB Created: 2021-04-10 14:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0b2a494ec86928db3aa9940f18395a6a SHA-1: db898ed2a463d1f6a8b415fdc35cc5278238fd68 SHA-256: e3fdc18591ae6a206ade32e5f3209bcd35380a8847d1a21fe85f0d7663a1bc02
186 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, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for phishing or distributing further malware. The embedded URLs and the heuristic firings point towards an attempt to redirect users to malicious 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://gimoguvi.ru/strik?utm_term=weider+pro+4950+weight+machine PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410703/normal_605f9e9132ce7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499653/normal_5fd9c976700b1.pdfIn PDF document text
    • https://titoboxe.weebly.com/uploads/1/3/0/8/130874676/3d6577e63f.pdfIn PDF document text
    • https://nometoxuf.weebly.com/uploads/1/3/4/2/134266561/a83ff2b787a.pdfIn PDF document text
    • https://jikumuwalomaj.weebly.com/uploads/1/3/1/3/131383204/93d79a41f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374536/normal_5fdc6641e9f8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483361/normal_60563709e18d3.pdfIn PDF document text
    • http://motarojetox.sportsontheweb.net/concise_pediatrics.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413121/normal_5fe22972d7bdf.pdfIn PDF document text
    • http://onlinesos.tech/52296656576hpwao.pdfIn PDF document text
    • http://choosemadam.site/funamutenipox9plh5.pdfIn PDF document text
    • https://toxosujaduwo.weebly.com/uploads/1/3/0/8/130874389/3470545.pdfIn PDF document text
    • https://zajebujop.weebly.com/uploads/1/3/4/9/134902249/vanusulinagitixewob.pdfIn PDF document text
    • http://golomashvanna.xyz/kugejomalenufufagitalen8n8s4.pdfIn PDF document text
    • https://xojemejavema.weebly.com/uploads/1/3/3/9/133987363/5381678.pdfIn PDF document text
    • http://bixekakazozerol.mywebcommunity.org/pearson_chemistry_florida_textbook.pdfIn PDF document text
    • http://warowusavi.mywebcommunity.org/vexoxifulofupejixur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_1b23cf30e6774d0ca9291609489ef999.pdf?index=trueIn PDF document text
    • https://931f52e6-cb68-4a93-8e02-54808d33f8b6.filesusr.com/ugd/6290de_9c14c872a7e246519424c1dabb9d3ed8.pdf?index=trueIn PDF document text
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_62e9cf8629e64b30ad3f87da48fc2de1.pdf?index=trueIn PDF document text
    • https://05282879-aed3-4f16-ac14-d534add4d4bd.filesusr.com/ugd/0f8b7c_e749479d25534dada34e2e99b81725ce.pdf?index=trueIn PDF document text
    • https://f45985d3-969e-4a4b-a16b-f92b7c881388.filesusr.com/ugd/20da2d_35105f71d67f41c1b35645a5dbbbea82.pdf?index=trueIn 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_off0000dfc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC5 5892 bytes
SHA-256: c26473c8ed52f2bc5848a0cf69c3a2c6675f124b07d53259f36fed0025c70f0c
font_01_sfnt_off0000f3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D3 11392 bytes
SHA-256: d779996c5cdccd9628bba2e7de33627936129773e5729fafd443e07052f43730