Malicious PDF — malware analysis report

Static analysis result for SHA-256 e790b1368a01b06b…

MALICIOUS

PDF

80.0 KB Created: 2021-04-08 10:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2920624e46043a8ad65f696d5bd82d5f SHA-1: 22aa8361cf2384a9ea71b8919a666003d03eaf88 SHA-256: e790b1368a01b06b380beabe2799c4a31505448672f2d0370d5a4dd769d19711
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on file-sharing services, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/strik?utm_term=self+assessment+examples+for+employees
    • https://jitebuxekuneba.weebly.com/uploads/1/3/5/3/135346248/c79f26.pdf
    • https://mulikejigezom.weebly.com/uploads/1/3/5/3/135351375/juwodilonuroxijipofo.pdf
    • https://cdn-cms.f-static.net/uploads/4488560/normal_600d1683bca1d.pdf
    • https://xitapazutirubej.weebly.com/uploads/1/3/4/8/134882608/e66b868479755.pdf
    • http://tejajugumoneton.66ghz.com/free_social_media_marketing_calendar_template.pdf
    • https://wabalunizuwa.weebly.com/uploads/1/3/4/6/134643533/23c24b677.pdf
    • https://cdn.sqhk.co/lamidipeke/hdHgew5/othello_game_instructions_rules.pdf
    • https://kidodizaramaba.weebly.com/uploads/1/3/4/0/134096495/1f998.pdf
    • https://cdn.sqhk.co/lagidexetin/S4ggDgh/89675298605.pdf
    • https://gonibokufelari.weebly.com/uploads/1/3/5/3/135346176/71fa058888e2.pdf
    • https://cdn.sqhk.co/vizakifito/fjgialK/kelijotekoxu.pdf
    • https://jetosopotow.weebly.com/uploads/1/3/4/0/134018613/jogerob.pdf
    • https://mujetuzavos.weebly.com/uploads/1/3/4/2/134266282/kupatawuwezib.pdf
    • https://cdn.sqhk.co/kibedutej/cGjhhfa/kuxujipozulovow.pdf
    • https://zarokosa.weebly.com/uploads/1/3/5/3/135300057/2005532.pdf
    • https://cdn-cms.f-static.net/uploads/4405420/normal_603acefe59411.pdf
    • https://vafoguvisijun.weebly.com/uploads/1/3/4/8/134887412/59e6daebba8.pdf
    • https://domufebulas.weebly.com/uploads/1/3/0/8/130814286/c7ebb.pdf
    • https://cdn-cms.f-static.net/uploads/4452852/normal_6042fb0b9ec94.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fexotupakel.rf.gd/42744033798.pdf
    • http://gipipirerogarul.rf.gd/48175756209.pdf
    • http://zamizok.epizy.com/how_to_open_a_ipynb_file_in_jupyter_notebook.pdf
    • http://bitixojofesozi.rf.gd/autism_behavior_checklist_abc.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efe8.bin
c2c1d6f0a60eddb09f2420a0a61f2bc786b1cf76e618f7c43a65f0ded6f86fc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE8 5060 bytes
font_01_sfnt_off00010101.bin
f40deeff9d60e01c729ef6e49fc17bd71af3f3ef6cce0f7da2565425f1c871af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10101 10268 bytes
font_02_sfnt_off00012414.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12414 4324 bytes

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