Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc3919419ab90f6…

MALICIOUS

PDF

69.4 KB Created: 2021-02-14 02:42:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 627c41bf445c0185a3da9e1258b33754 SHA-1: b17eabfe7a308c19167758b68878cc0c549b61d9 SHA-256: 3fc3919419ab90f6a1a792f9d5b99c8d01a6f7d6c479df807e48e2fbb016e62f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external links, including a 'link farm' heuristic, suggests the document is designed to redirect users to potentially harmful websites. The embedded URLs, such as 'https://baarspo.ru/wix?keyword=skullmasher+borderlands+2', are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://baarspo.ru/wix?keyword=skullmasher+borderlands+2 PDF link annotation
    • https://cdn.sqhk.co/rewakevutel/idhezuv/60864982337.pdfIn PDF document text
    • https://dukinuvofipul.weebly.com/uploads/1/3/2/7/132711936/boxomodutorularuse.pdfIn PDF document text
    • https://baboxubawuxi.weebly.com/uploads/1/3/4/6/134666135/1a2ead6.pdfIn PDF document text
    • https://revivumusemob.weebly.com/uploads/1/3/5/4/135400225/zametav.pdfIn PDF document text
    • https://jitaginedisa.weebly.com/uploads/1/3/4/3/134324559/4013523.pdfIn PDF document text
    • https://mojogobiwed.weebly.com/uploads/1/3/4/7/134747953/tixodusimesor_tunogosa.pdfIn PDF document text
    • https://xafukulirodut.weebly.com/uploads/1/3/1/3/131379356/e81e717ac2ad.pdfIn PDF document text
    • https://cdn.sqhk.co/dakagugi/Egghe69/59692692339.pdfIn PDF document text
    • https://cdn.sqhk.co/vomuvojovi/B2hdIig/dajubuvodurizoterivov.pdfIn PDF document text
    • https://mifurujuxix.weebly.com/uploads/1/3/3/9/133997148/946968.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/gunmetal_steel_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/information_systems_test_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/plotting_coordinates_worksheets_free.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/chocolate_malayalam_movie_phone_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/saxax.pdfIn PDF document text
    • http://jonutozomekuna.epizy.com/11279629313.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/zejiki.pdfIn PDF document text
    • http://bilunijo.epizy.com/otp_verification_email_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/nagikibudisebezaworip.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_off0000d2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A8 5504 bytes
SHA-256: 94b17a0089602bddb313217de79258a6bb54e0ec406519df189d9649e00bb0a7
font_01_sfnt_off0000e529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE529 10380 bytes
SHA-256: b9cc3f370739180d3e72238704173a6d3a1335ace475b66c0c1127148caffe20

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