Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf9fb278b305152…

MALICIOUS

PDF

77.3 KB Created: 2021-04-07 11:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3adfa7ae173a5e725cb1fe46667024c8 SHA-1: e5335024535b5fe04fa5e308f7d112c951816319 SHA-256: 4cf9fb278b305152be14bb405232121c1eac2a7efa166c68acba695e2051173a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to lead the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/strik?utm_term=best+quotes+from+alice+in+wonderland PDF link annotation
    • http://lowusonuraku.mygamesonline.org/identification_of_functional_groups_in_organic_compounds_practical.pdfIn PDF document text
    • https://lilususuki.weebly.com/uploads/1/3/4/3/134317990/415519.pdfIn PDF document text
    • http://zevewidojodot.mywebcommunity.org/98025381319.pdfIn PDF document text
    • http://mogimetekojubar.scienceontheweb.net/catalogo_suvinil.pdfIn PDF document text
    • http://kutatit.getenjoyment.net/norcold_refrigerator_replacement_chart.pdfIn PDF document text
    • https://lemitixodage.weebly.com/uploads/1/3/4/8/134868200/wefenaxo.pdfIn PDF document text
    • https://falibapop.weebly.com/uploads/1/3/3/9/133997194/jovudi.pdfIn PDF document text
    • http://dipurenirexo.22web.org/kirazowebaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gelonixaj.rf.gd/what_is_conflict_in_business.pdfIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/fogogurenoxadupejole.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/aberto_sonorus_sony_android_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/girlfriends_guide_to_divorce_season_2_cast.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/rufigubuwenepu.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/kewazaromativu.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/25134880774.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/silver_shadow_apartments_federal_way_washington.pdfIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_4862c935202940a2b7fd8e4a7835c132.pdf?index=trueIn PDF document text
    • http://kidutal.rf.gd/bugapurolulox.pdfIn PDF document text
    • https://4e4608fd-868e-43f5-b6ba-14e5e4b50785.filesusr.com/ugd/b1f235_5ffd527f01f2479c90f06e5a2bf5155c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/ac3_file_format.pdfIn PDF document text
    • https://s3.amazonaws.com/dagasopones/25574040841.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/do_you_capitalize_job_titles_without_a_name.pdfIn PDF document text
    • http://vubuzixefixa.onlinewebshop.net/attribution_theory_social_psychology.pdfIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_38b7c450811740f8962e626518bf3179.pdf?index=trueIn 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_off0000f14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14C 5436 bytes
SHA-256: 09cf2c4d801b253072bfae9fcf167af88951b7a73e6d309990152b3aba668575
font_01_sfnt_off000103c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C1 10584 bytes
SHA-256: 393f730bd25508471c419c904af8c3e204e0e9d90bfde499893fb54ebd30297a

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