Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8b5d7464d6d632…

MALICIOUS

PDF

80.0 KB Created: 2021-02-19 17:27:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6982e443c1b8f21f13be8bb70c75a6f1 SHA-1: f41d0ad99534ac8be614d2cd5b10091934b930a2 SHA-256: 8a8b5d7464d6d632522353e51ef07acabfdbe9a63bbbd91f6b2565e0a97baa23
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were directly extracted, the presence of numerous URLs points towards a phishing or SEO spam campaign, likely initiated via a spearphishing attachment.

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://jottigo.ru/123?utm_term=does+prodigy+math+have+an+app PDF link annotation
    • http://zupubovogigu.iblogger.org/kepesi.pdfIn PDF document text
    • http://sallehq.xyz/46331644906tnt8k.pdfIn PDF document text
    • http://samiter.22web.org/mcdonald_s_menu_2019.pdfIn PDF document text
    • http://lolkek.xyz/tuxuvavepiledeniwa8l9ag.pdfIn PDF document text
    • https://luzuredero.weebly.com/uploads/1/3/4/0/134016924/fobezexisinal.pdfIn PDF document text
    • http://creditscorefix.info/pivisapijerateroxuwoipc1r.pdfIn PDF document text
    • http://bivoxuwod.iblogger.org/the_north_face_mens_jacket_size_guide.pdfIn PDF document text
    • http://bobixuposu.22web.org/codehs_karel_answers_1._13._4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xitemefunugege.epizy.com/rokawap.pdfIn PDF document text
    • http://xepatijorarizom.epizy.com/kikupewudefekepufijesafug.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/5640142729.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/42346818284.pdfIn PDF document text
    • http://zotowivivakav.rf.gd/raninujowugibofonuf.pdfIn PDF document text
    • http://lafasusatar.rf.gd/lines_of_symmetry_worksheets_grade_6.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/alexa_app_android_outside_us.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/39169058137.pdfIn PDF document text
    • http://wapinogure.epizy.com/varafob.pdfIn PDF document text
    • http://saranexujeg.epizy.com/wainwrights_dog_food_puppy_feeding_guide.pdfIn PDF document text
    • http://daforewepon.epizy.com/98901231806.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_off0000fb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2B 5504 bytes
SHA-256: 7d97fee3667a6e5cd1ad779dfe0adae1667e4fd6a5fb7ece78aa8e30aaa5a841
font_01_sfnt_off00010dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC9 10840 bytes
SHA-256: d3a4975742eb3d6e1769f476f9b5cbcdbb33e897afffd1b6b3f2660a13d5ca30

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