Malicious PDF — malware analysis report

Static analysis result for SHA-256 24cdb59b04e2f5de…

MALICIOUS

PDF

76.9 KB Created: 2021-03-27 12:31:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbeb7ea693a7d5b31c7bfa7a22b80ea1 SHA-1: d1a18b1b777450e7cdf6c78707a372f5d5f44968 SHA-256: 24cdb59b04e2f5ded007bd79d65640243bdc30b9afcceb6d4390f43b9280ceb6
156 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO poisoning attack. The primary URL, https://midufefew.ru/award?keyword=dairy+wastewater+treatment+plant+design+pdf, indicates a lure related to wastewater treatment plant design, likely to deceive users into downloading further malicious content or providing sensitive information. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/award?keyword=dairy+wastewater+treatment+plant+design+pdf
    • https://static.s123-cdn-static.com/uploads/4393353/normal_60057d31c9e75.pdf
    • https://xuvupidorok.weebly.com/uploads/1/3/1/4/131407629/sawarufuv.pdf
    • https://cdn-cms.f-static.net/uploads/4368770/normal_605c48382c31b.pdf
    • https://mebijanuwirat.weebly.com/uploads/1/3/4/0/134042853/9b7fc83ba575357.pdf
    • https://wonefosobafig.weebly.com/uploads/1/3/4/4/134479447/pemamarigubipal.pdf
    • https://cdn-cms.f-static.net/uploads/4487386/normal_6046fe87c32b7.pdf
    • https://xexidizufom.weebly.com/uploads/1/3/4/5/134508107/taribejuvomipij_xowajulexujisu.pdf
    • https://rutarutan.weebly.com/uploads/1/3/5/2/135294158/wasefaso.pdf
    • http://dvigatel.guru/what_are_the_types_of_progress_reportu1yn1.pdf
    • http://onlinesos.tech/vuzuzimopoweronezuxeboweqgihi.pdf
    • https://cdn-cms.f-static.net/uploads/4408177/normal_5fd81bdfaa8c1.pdf
    • https://static.s123-cdn-static.com/uploads/4494661/normal_6001e688afc12.pdf
    • http://wunadimizurened.medianewsonline.com/76430233964.pdf
    • https://cdn-cms.f-static.net/uploads/4368952/normal_6042fb7cb3b18.pdf
    • https://cdn-cms.f-static.net/uploads/4374177/normal_60516134ded9f.pdf
    • https://cdn-cms.f-static.net/uploads/4449177/normal_6019f70ae8f4e.pdf
    • http://felesatediz.medianewsonline.com/gunumonatosuronanumepat.pdf
    • http://study-english-04.space/bluebeam_free_studentvsjcz.pdf
    • http://ladekepevij.mygamesonline.org/pneumonia_bacteriana_em_caes.pdf
    • https://nudijezomuxu.weebly.com/uploads/1/3/4/3/134377325/bikubukilere.pdf
    • https://wedabivugexum.weebly.com/uploads/1/3/0/9/130968949/3c2f4d91f9.pdf
    • https://togurugake.weebly.com/uploads/1/3/1/4/131412858/7451543.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eadd.bin
0f316f8cee85adb9ebcd45397261d6a129c6306ab6ccaf5f6a2c4a820081049f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEADD 5552 bytes
font_01_sfnt_off0000fdcd.bin
937dfd771598696b2e66adc766c3924ecd9b56d33acbd38358de80ca4e0a51ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCD 11252 bytes

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