Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9dc38b96c0f89a6…

MALICIOUS

PDF

95.4 KB Created: 2021-02-25 04:35:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ce8e007ba1d35fed82e4817b80b5f4bb SHA-1: ff348d715c30eb639e7dea7d607a7552c414b2cb SHA-256: b9dc38b96c0f89a611a9d3cdb3058f6af42b7b5857e677fb926dc36185e2cbd7
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains, indicating a link farm designed to redirect users. One critical heuristic identified a link to known malicious redirector infrastructure, and ClamAV detected it as Pdf.Phishing.Trojan. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the extensive link farm suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://crophysi.ru/strik?utm_term=basic+concepts+of+civil+engineering+pdf In PDF document text
    • http://gefosezidubajoz.scienceontheweb.net/nedebutisepijo.pdfIn PDF document text
    • https://bonesinidojesu.weebly.com/uploads/1/3/4/5/134591006/7aa43fdd1e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490722/normal_601b3111d963d.pdfIn PDF document text
    • https://golinogejus.weebly.com/uploads/1/3/1/6/131606227/6ffbf432.pdfIn PDF document text
    • https://tabowemonikose.weebly.com/uploads/1/3/5/9/135957185/gafinaj.pdfIn PDF document text
    • http://kikababono.mywebcommunity.org/will_doctors_do_home_visits.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/ehcgejf/pixel_launcher_android_10_apk_xda.pdfIn PDF document text
    • https://rixedevo.weebly.com/uploads/1/3/5/3/135306589/3299fe5a1a.pdfIn PDF document text
    • https://lukumupanulafaz.weebly.com/uploads/1/3/4/6/134683212/4165930.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484999/normal_602519ab2dcc2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wagibederujejo.rf.gd/algebra_y_trigonometria_addison_wesley.pdfIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/how_to_check_radon_gas_levels.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/excel_inspection_checklist_template.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/el_poder_de_la_kabbalah_espaol.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_off0001355d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1355D 5432 bytes
SHA-256: 75839d6549a5f3a0f2f17115d620a2dfa094703142907ab64a9c9f53cc2cd059
font_01_sfnt_off000147f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F4 12388 bytes
SHA-256: 35fc9db79b8956e10aa4552f4a959b469f6c910707d82784acaf54c22684efe7

Open this report in the interactive analyzer, or submit your own file for analysis.