Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb9b6ae1ddbc997…

MALICIOUS

PDF

70.2 KB Created: 2021-02-16 04:32:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ef46056fba616924816454ec258a2231 SHA-1: 7aac3e8148b0545ff18563b55b0ff097aa436832 SHA-256: 0cb9b6ae1ddbc9979b18bb38fdf8045f68029168c7f791f8fc11b70a86f2f27e
184 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links pointing to known malicious redirector infrastructure and disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious redirector pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=searsport+high+school+calendar In PDF document text
    • https://biruvosuvibu.weebly.com/uploads/1/3/0/7/130739381/4179810.pdfIn PDF document text
    • https://bilugejedegigel.weebly.com/uploads/1/3/4/0/134017605/topofavelan_xufegovanuze_bugisuzoraniker.pdfIn PDF document text
    • http://voztrans.ru/nfs_heat_studio_stuck_on_loading_screen3624w.pdfIn PDF document text
    • https://pefibiwurabamiz.weebly.com/uploads/1/3/0/8/130874510/bugujod_votimavak_fosivipodu_bofepokudodaf.pdfIn PDF document text
    • http://abistrans.ru/luwuradisamitexac91r3.pdfIn PDF document text
    • https://komuwewolidixat.weebly.com/uploads/1/3/4/8/134871085/wunez_wafufol_givopagofobe.pdfIn PDF document text
    • http://carbackseat.site/govivusaperazesuwibeljyxj.pdfIn PDF document text
    • https://cdn.sqhk.co/voromerubagu/cjggcjd/78526558107.pdfIn PDF document text
    • https://tomumexajozovod.weebly.com/uploads/1/3/0/9/130969356/dbf29a4af6a9c0.pdfIn PDF document text
    • http://icub.tech/69352105297uxy5z.pdfIn PDF document text
    • https://cdn.sqhk.co/kezixowog/Ufegdie/ginezojozupoduluja.pdfIn PDF document text
    • http://gatorama.space/redirajs3y8a.pdfIn PDF document text
    • https://cdn.sqhk.co/dunafafaxen/7iajhhi/potamepedojikidapumiwike.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/resisuna/webujer.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/15779821234.pdfIn PDF document text
    • http://zekumom.epizy.com/spider_man_trailer_2019.pdfIn PDF document text
    • http://mujubelajuzuj.rf.gd/bootstrap_4_responsive_website_templates_free.pdfIn PDF document text
    • http://zerujafulo.rf.gd/android_mobile_backup_app_free.pdfIn PDF document text
    • http://sazosubegus.epizy.com/nikiz.pdfIn PDF document text
    • http://bipedok.epizy.com/36312353842.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/14509617082.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_off0000d5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EA 5436 bytes
SHA-256: 24081c7313721ff0db0001e6b94fcccb3c342cf5232657b424cffc284a7af96e
font_01_sfnt_off0000e85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85C 10416 bytes
SHA-256: a3aa6f9735286eb8f268ac54aa52b38f5686b8ac4ea462e324607eb7b577d813

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