Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e16824a32a52d27…

MALICIOUS

PDF

78.1 KB Created: 2021-04-28 03:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f8e3cdf981eb82c387aa51004a47d45b SHA-1: 2c649011fd3b24ee0ea7f579fa83e4d172fc3d2f SHA-256: 5e16824a32a52d274bed365de357eb4888384eafbe853186912184db7121d9c8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains and Weebly hosting, indicating a link farm or SEO manipulation scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further malware or phishing content. The embedded URLs and the overall structure point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/strik?utm_term=calories+in+a+dunkin+donuts+boston+cream+donut PDF link annotation
    • https://bolukuja.weebly.com/uploads/1/3/0/7/130739437/jemabuvabil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379851/normal_600be0be7c1ae.pdfIn PDF document text
    • https://xaluromaw.weebly.com/uploads/1/3/4/8/134862284/guxonakowuli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401694/normal_605582212f65b.pdfIn PDF document text
    • https://dilazewinu.weebly.com/uploads/1/3/0/9/130969594/xarukanibegoke-gonekiramiluz-nenesolovori.pdfIn PDF document text
    • http://japarof.mywebcommunity.org/angiographic_views.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454545/normal_600ba5a370528.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404105/normal_60446ca5c8fd7.pdfIn PDF document text
    • http://cloudmarket.website/vulamotititurotozojasesal7870i.pdfIn PDF document text
    • https://ribarifi.weebly.com/uploads/1/3/4/2/134266405/54a782ebaa2c19d.pdfIn PDF document text
    • http://free-at.pro/davis_wireless_vantage_vue_weather_station_model_6250c3rzp.pdfIn PDF document text
    • https://mifurujuxix.weebly.com/uploads/1/3/3/9/133997148/8006807.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417046/normal_606c3d607ac02.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_2eb44e67ec4b4712b72173b341f7b37f.pdf?index=trueIn PDF document text
    • https://6ce95562-7558-49ee-a7b0-b3003db3b0e9.filesusr.com/ugd/d13e1f_9a346dd7aef3488c800be55017a7aeb9.pdf?index=trueIn PDF document text
    • http://peruroz.onlinewebshop.net/aluminium_1100_properties.pdfIn PDF document text
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_47622a29d8954c789bfe20e02c5aba5a.pdf?index=trueIn PDF document text
    • https://89d37d93-eaf9-4fc7-8d5e-07438b8f18e7.filesusr.com/ugd/e80f4c_2384918557d04a798f31d4ca6395af64.pdf?index=trueIn PDF document text
    • https://73099f28-10d5-4558-98a1-2f8dc61f1a2f.filesusr.com/ugd/f62eaa_50d6137be7e645778e79979859359f82.pdf?index=trueIn PDF document text
    • https://510b81f6-be4e-4e40-9acf-3f60af495837.filesusr.com/ugd/5f226b_b9a71a11cdd345239d23b4d4d1fdc377.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FE 5196 bytes
SHA-256: 201d78762e6279aa30856dabfba9398c2094dbca8187c9c360d219a2fa7ca63d
font_01_sfnt_off0000fb84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB84 1940 bytes
SHA-256: 3c8c70e95e172d87f88249f6e98f5fcd1d779dd22b9512bb6276049fa774e71f
font_02_sfnt_off000104bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BC 11032 bytes
SHA-256: 996d72cd53bb114dadeb5901c5a24db7affe70f0a04517bc52203751e9ab1ab2