Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeb8c84211f4ecb2…

MALICIOUS

PDF

88.0 KB Created: 2021-03-27 22:44:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 20c24c9e73530ab2051fb9802bbccfe3 SHA-1: 5cc1beabc754ed563a84522c5046a13366aab414 SHA-256: aeb8c84211f4ecb26c4e9c968f08f123ab680c0d6118411ee8c241a5c38966bb
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains keywords related to academic essays, likely a lure to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gimoguvi.ru/award?keyword=argument+essay+gre+examples+pdf PDF link annotation
    • http://navelina.iblogger.org/97255434034.pdfIn PDF document text
    • https://rupimobo.weebly.com/uploads/1/3/4/8/134891389/kuzinav.pdfIn PDF document text
    • http://wupunekum.getenjoyment.net/self_assessment_tool_for_teachers_deped.pdfIn PDF document text
    • http://vujuxivawopigu.22web.org/81401634920.pdfIn PDF document text
    • https://bopovajo.weebly.com/uploads/1/3/5/9/135966354/zonimifiral_zixotu.pdfIn PDF document text
    • http://vomeperegobo.22web.org/suxatedobidus.pdfIn PDF document text
    • https://furureseseruwa.weebly.com/uploads/1/3/4/4/134481841/aac24d3.pdfIn PDF document text
    • http://siresunadujoz.iblogger.org/windows_on_the_world_complete_wine_course_2019_edition.pdfIn PDF document text
    • https://xutekesavugev.weebly.com/uploads/1/3/5/3/135316407/8148141.pdfIn PDF document text
    • https://raponomipa.weebly.com/uploads/1/3/2/6/132681826/jelevogunijive.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://koxowideza.epizy.com/vikafupifumuju.pdfIn PDF document text
    • http://sewugobavi.rf.gd/65903097363.pdfIn PDF document text
    • http://xumugipetoje.epizy.com/historia_de_la_astronomia_maya.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/fizugo.pdfIn PDF document text
    • http://jipidabaxepej.epizy.com/acca_member_form.pdfIn PDF document text
    • http://jopugobov.rf.gd/dozekupewodasavagewa.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/eromski_ludzie_bezdomni.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/70632419808.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/52338471318.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/midterms_answers_persona_5.pdfIn PDF document text
    • http://taberadajip.atwebpages.com/washington_gas_credit_union_login.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/garfield_cake_pan_box.pdfIn PDF document text
    • http://nijugatujoz.rf.gd/levikokorubofisa.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_off000119e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E3 5520 bytes
SHA-256: 824a88bbc1ac04f5e4bcf4d62b320678900572f5b40fd5abe46a46e37687114b
font_01_sfnt_off00012ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA5 11016 bytes
SHA-256: 81423655500ce468ee077d2fa4e322e260bd93e207d63977a7b3ce7229ad06f7

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