Malicious PDF — malware analysis report

Static analysis result for SHA-256 be73bd92a508648a…

MALICIOUS

PDF

79.9 KB Created: 2021-02-16 18:46:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 53062d579d510f850a222b6818210b30 SHA-1: 7e5578893a29aeb3ac71c0c77ed722cab9534e65 SHA-256: be73bd92a508648a0d2b2d381e17e0829cb0bf54674c8324f39e8d8259d7d75d
284 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, with several pointing to known malicious redirectors and suspicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. The document body, though heavily obfuscated, appears to contain metadata related to its creation, but the primary malicious functionality is driven by the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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/strik?utm_term=slater+and+norman+books+in+order In PDF document text
    • https://cdn-cms.f-static.net/uploads/4411916/normal_60295b68c6107.pdfIn PDF document text
    • http://securityofusersdevicesonline.site/99390211606lc0wd.pdfIn PDF document text
    • https://datipozor.weebly.com/uploads/1/3/0/8/130813945/8964864.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494432/normal_5fc9d71313aa0.pdfIn PDF document text
    • http://top-agent.ru/car_accident_reports_near_me_todaytmgzq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476288/normal_60096929089af.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/eeKji8O/red_alert_2_units_explode.pdfIn PDF document text
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/baket_pusavevode_xefeberuziw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530868/normal_602a388f6b0ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418188/normal_5fdc63d1aa93c.pdfIn PDF document text
    • http://sberin.xyz/49064248099ja9e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370547/normal_5fddf522df192.pdfIn PDF document text
    • https://cdn.sqhk.co/zosikoto/TA3R3Ux/turkish_drama_ringtones_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423715/normal_5fe61b9286dc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453103/normal_6029621d7af08.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459188/normal_5fed48cf17cc6.pdfIn PDF document text
    • https://ganubidorebe.weebly.com/uploads/1/3/2/7/132740923/9769910.pdfIn PDF document text
    • http://uabiomanix.xyz/3_week_look_ahead_template_excelszspf.pdfIn PDF document text
    • http://frontglass.xyz/jonuwavummu0tb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379482/normal_600d8e21ae23b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407804/normal_5fddf8da10a70.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98F 5280 bytes
SHA-256: 2fe9fc653311c4a9b9439ac2f1c5543fd02b4617602326dcb7c8e4014964710a
font_01_sfnt_off00010b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B65 10884 bytes
SHA-256: 614c691358afd2ee18b8e31947956d7554e577663e3d9b719d2784d8770aaa68