Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8479a482faa1307…

MALICIOUS

PDF

80.8 KB Created: 2021-03-06 13:48:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 596dfba5bba37b1548defa177d2cd50a SHA-1: f8d6e466bd0e741ab95de17ea465dde124c6ed7f SHA-256: e8479a482faa13070da079107df5298fb15b4047a1ee96b1cfe3ff12d1b6f687
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with the primary suspicious URL being https://jumiwimov.ru/aws. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan variant. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/aws?utm_term=why+did+miss+muffet+need+a+road+map+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444100/normal_5fd88c98180bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451555/normal_603b2858c876d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479707/normal_6007a40a85c93.pdfIn PDF document text
    • http://lijaziba.22web.org/what_bac_range_is_warm_and_fuzzy.pdfIn PDF document text
    • https://xemiwiwoxotewa.weebly.com/uploads/1/3/5/3/135325065/2f4cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448539/normal_60180e8628f9e.pdfIn PDF document text
    • https://cdn.sqhk.co/jigidokasaga/jepGLAr/chapter_6_entrepreneurship_and_small_business_management_quizlet.pdfIn PDF document text
    • https://cdn.sqhk.co/godidudawat/ighajha/76198898582.pdfIn PDF document text
    • https://kusikulovaledif.weebly.com/uploads/1/3/1/6/131606813/7487129.pdfIn PDF document text
    • https://cdn.sqhk.co/dasadogiso/gjKTheT/spelling_learning_games_for_adults.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527345/normal_5ff35c0753c4f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489975/normal_5ff95e30a1835.pdfIn PDF document text
    • https://cdn.sqhk.co/lobinazema/idnslwI/ligarugaganavokozeba.pdfIn PDF document text
    • https://cdn.sqhk.co/binisomomup/avMOhie/baxerumufiwodeboti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450507/normal_601dbb8498ccb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jasebusezazov.rf.gd/25875296231.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/bacillus_licheniformis_colony_morphology.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/jadiwuzufisuresopipu.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/8454995883.pdfIn PDF document text
    • http://xeladijigaw.epizy.com/10125845529.pdfIn PDF document text
    • http://bejutamukedus.epizy.com/xemobomipojerisixofosedi.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/kebufojosewupakap.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/vubedededetegevulavizudij.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_off0000fe0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0E 5520 bytes
SHA-256: c5c21b81af805c361ed4b47604972b2caa74f6e555c7fc9279cf2786f4f72736
font_01_sfnt_off000110c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C8 10832 bytes
SHA-256: 974431a4874a27c1916525c6460e376de663993b813e052b35e6e9c4f71be7b1

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