Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d62ab67ae4df77…

MALICIOUS

PDF

76.4 KB Created: 2021-03-20 04:04:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db6b3852ec3735dfe4af7686d6581228 SHA-1: 223415372d1530d0483d44ad9676e3548c35016d SHA-256: e5d62ab67ae4df77d4089d0b82bb6036b0cfe86f63e0231411d81309ec072b9c
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 of which point to other PDFs, suggesting a link farm or redirection mechanism for malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful sites.

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://resalured.ru/123?utm_term=unzip+tool+for+android
    • http://fresh-ita.fun/hewlett_packard_puerto_rico_aguadillalk1c1.pdf
    • https://static.s123-cdn-static.com/uploads/4468289/normal_5fe3fd80de3f0.pdf
    • https://fokididekorup.weebly.com/uploads/1/3/0/7/130775810/5840124.pdf
    • https://dirusase.weebly.com/uploads/1/3/1/0/131070798/4d94d2313275c.pdf
    • http://okrasote.info/wafuxojaju9hirn.pdf
    • http://fafijitesulexiz.mygamesonline.org/zegunevor.pdf
    • https://figuzenage.weebly.com/uploads/1/3/4/4/134472600/185e52e169aaab5.pdf
    • https://wanalepawipetep.weebly.com/uploads/1/3/1/8/131857983/levefurafipaz.pdf
    • https://static.s123-cdn-static.com/uploads/4460682/normal_600039a2ca80f.pdf
    • https://static.s123-cdn-static.com/uploads/4459057/normal_5fdfd3b9473de.pdf
    • http://grantmedica.ru/47458622775wujb3.pdf
    • http://medway24.com/schema_electrique_moteur_asynchrone_monophase1ne17.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lixasifasi/laboratory_guidelines_for_huntington_disease_genetic_testing.pdf
    • https://s3.amazonaws.com/vavapekadoliti/buzil.pdf
    • https://d650f791-4ca6-4964-96f1-ba9fac0414c1.filesusr.com/ugd/adf9cb_12368639c2014d338eb6d0f096642c4e.pdf?index=true
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_0f77c968f3424120922caf759121944b.pdf?index=true
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_85151ba724f749e2a51d759016e4fcae.pdf?index=true
    • https://s3.amazonaws.com/mamukawaxatali/8165799556.pdf
    • https://4edd92ed-4e96-4c3d-a837-a16c7246ae9e.filesusr.com/ugd/7c3149_5e1469b1d7084403a89633b017a3f311.pdf?index=true
    • http://kepofif.onlinewebshop.net/what_is_an_example_of_positive_and_negative_reinforcement.pdf
    • https://6b9ff03a-ef48-417a-a14c-919df0f903d0.filesusr.com/ugd/f459ea_60efb7d4fc454ad6b5f1a6ba1c177692.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee26.bin
0275d9591117d41efb4e52681c8c25832a01571a9b383401b466205979dba363		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE26 4896 bytes
font_01_sfnt_off0000feec.bin
433733e7e1d15c6b775cf946dd1af251fd62d755de69d8bb68940b55faf06a16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEC 10920 bytes

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