Malicious PDF — malware analysis report

Static analysis result for SHA-256 be00d055aadca849…

MALICIOUS

PDF

78.8 KB Created: 2021-03-17 14:20:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0d411b3d41c70e9344df0ca87c0ce80f SHA-1: 30cf013c5b6d2d2922e305aedc2d44d23984e6c4 SHA-256: be00d055aadca849513cb66260b8c61c589944786770bb9a7eabf8eba178cdb0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://druttle.ru/strik?utm_term=welding+for+beginners+pdf PDF link annotation
    • http://hytri.com/pekuki1bwuo.pdfIn PDF document text
    • http://netewe8.xyz/52580604915txk5x.pdfIn PDF document text
    • http://nejamaranidirit.22web.org/instagram_black_theme_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377381/normal_5ff925eff2d20.pdfIn PDF document text
    • http://akmurzina.com/mefaxokaberabetukudefurgenys.pdfIn PDF document text
    • http://opit.space/child_care_aware_ndy5klf.pdfIn PDF document text
    • http://ninavadilu.22web.org/mejoguwulerowanotez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467945/normal_600d3d81e4e80.pdfIn PDF document text
    • http://tuvivukaroj.mygamesonline.org/32432187560.pdfIn PDF document text
    • http://uscarins.info/zubalidotinokiwbwb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369334/normal_60081bec87db4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_a006de60d074448f9fc60e59540834b5.pdf?index=trueIn PDF document text
    • http://nejabet.epizy.com/40450566968.pdfIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_c5099bcf16bd40f9a2cee4161907bacb.pdf?index=trueIn PDF document text
    • http://nedukej.rf.gd/96962056337.pdfIn PDF document text
    • http://xanokilil.rf.gd/30348304484.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/leptospirosis_guidelines_pediatrics.pdfIn PDF document text
    • http://semowomeso.onlinewebshop.net/twitter_ads_guide.pdfIn PDF document text
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_288a74ae4949408f9934d6bb066aa4f8.pdf?index=trueIn PDF document text
    • http://vidugozu.atwebpages.com/reloading_supplies_gridley_california.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/android_tablet_with_pen_input.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/69224228935.pdfIn 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_off0000f76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76E 5152 bytes
SHA-256: 99a2d3ba4ff574d52c37000305fbeb8e4e2994e7ccce5a481b233eb51637cfbb
font_01_sfnt_off00010910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10910 10936 bytes
SHA-256: f11252e2a1810932bccfd934387578cc1fce1e6ff81ff0cd0fb27b4e78349676

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