Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11cdd00f1474a67…

MALICIOUS

PDF

78.4 KB Created: 2021-04-04 12:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 85051efdf35566f065c6ea3f9c3fa0df SHA-1: e6a81db36d741db02b6b359065ee737a73f742f4 SHA-256: c11cdd00f1474a67d3da3828ea9285ccf224d965a79fa8229d1a3edfcc578b21
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to 'jumiwimov.ru/award?keyword=cursuri+antreprenoriat+pdf', suggesting a lure for phishing or a scam. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity, likely involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/award?keyword=cursuri+antreprenoriat+pdf PDF link annotation
    • https://cdn.sqhk.co/talurelope/7hi9xhb/14155606478.pdfIn PDF document text
    • https://cdn.sqhk.co/bomoxale/igpvha6/dowegarajebeziweroxo.pdfIn PDF document text
    • http://probnik1313.tech/pawimofadivuta53wdr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530868/normal_605aba33e0e33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423429/normal_5fdc1326446d4.pdfIn PDF document text
    • https://cdn.sqhk.co/kufomopinu/gggfifa/messenger_marketing_tools.pdfIn PDF document text
    • https://cdn.sqhk.co/xafeperale/chjEhan/network_topology_tutorial.pdfIn PDF document text
    • http://construt.site/39018759923500oa.pdfIn PDF document text
    • https://cdn.sqhk.co/pagifizipafo/rjjibha/65072632305.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/gJnNZA2/pop_shooter_blast_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/voravaxa/sjjyBia/mexadozuwibuforuwifo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500893/normal_6005d9dfdc8eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408471/normal_6006f631d7407.pdfIn PDF document text
    • http://trujillostacoshop.com/the_soul_collector_2019_ending_explained0aj4h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476285/normal_5fea18b9a1cae.pdfIn PDF document text
    • https://cdn.sqhk.co/zapiseniw/QWhf3jo/diy_ninja_rope_course.pdfIn PDF document text
    • http://cashbackk.site/80917537194g7yrg.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/muvojugejoxip/gebopaxawexod.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/zuviwur.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/tornado_diagram_excel_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/gefidoxawezuguvon.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/gezegupamerexu.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_off0000f4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B1 4908 bytes
SHA-256: b6be632b6c2afa3e52493ef3ba7b3e9f7b59d9531b5d6b95ba6baf8304a7f59e
font_01_sfnt_off00010570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10570 12164 bytes
SHA-256: f386c48fd1a3ba007fa3b1dd88a4d1095b60892e8b18dccbaf0d7776321e876a

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