Malicious PDF — malware analysis report

Static analysis result for SHA-256 d21b4d6532881a01…

MALICIOUS

PDF

82.7 KB Created: 2021-02-02 15:36:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: d694a89183a6519d2bf4c3d5f20d72cb SHA-1: 62c919f89c4b17c07afacca614e071557f22ba5c SHA-256: d21b4d6532881a01185ce710701b46a70756fe1e22b0af3ceceb4d2c83b438ae
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=biometric+attendance+system+software In PDF document text
    • http://rujawobezixevib.iblogger.org/android_vs_ios_security_privacy.pdfIn PDF document text
    • http://beliyden.xyz/history_lesson_plantql04.pdfIn PDF document text
    • https://mibuvenatevuwo.weebly.com/uploads/1/3/4/6/134607329/raxusinasuvenawese.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385422/normal_5fc7ec100be06.pdfIn PDF document text
    • http://lnstagram-helping-centre.com/mordenkainens_tome_of_foes_downloadhghhe.pdfIn PDF document text
    • http://topuniversityru.fun/economics_for_dummies_free0avr8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465935/normal_5fcf0c65e87a6.pdfIn PDF document text
    • https://kusikulovaledif.weebly.com/uploads/1/3/1/6/131606813/6236760.pdfIn PDF document text
    • https://mojoranazo.weebly.com/uploads/1/3/4/4/134403481/16dd594c846.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419430/normal_5fd90add27602.pdfIn PDF document text
    • http://bu-markett.com/45306695461yufmv.pdfIn PDF document text
    • https://gelowoxolup.weebly.com/uploads/1/3/4/7/134703814/1193024.pdfIn PDF document text
    • https://gawofatofuwe.weebly.com/uploads/1/3/1/3/131380275/zevirigubifo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://golokelu.rf.gd/pokijomu.pdfIn PDF document text
    • http://popirarubinuluk.rf.gd/metastatic_melanoma_treatment_guidelines.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_off0001081f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081F 5376 bytes
SHA-256: 21b8a52b7b9b23de86a665039a1f59057277e29a92e544ab8ccd208a98961569
font_01_sfnt_off00011a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A69 10360 bytes
SHA-256: 290a59a897d638cec36dc985db7459b7f9064218bc309510bb3745076a82208d