Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39df2f073f26c31…

MALICIOUS

PDF

64.7 KB Created: 2021-02-18 13:36:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: a18c8c891ee21c2277333b8fd2893db7 SHA-1: cdad72db6d7cd3d21bac1b6929de27bc862de788 SHA-256: d39df2f073f26c31ea0eaac2fcdfd2065890389b95448f406d791527074e3a51
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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=norton+field+guide+to+writing+4th+edition+ebook In PDF document text
    • https://cdn-cms.f-static.net/uploads/4472479/normal_5fda0f817a1a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373776/normal_600898a9b3fbc.pdfIn PDF document text
    • https://tivirubopif.weebly.com/uploads/1/3/1/4/131406506/e9d95cc67.pdfIn PDF document text
    • http://bilapak.66ghz.com/psd_templates_id_card.pdfIn PDF document text
    • https://begazasageb.weebly.com/uploads/1/3/1/6/131637419/ccd4e3d0a1.pdfIn PDF document text
    • https://pirodiditabun.weebly.com/uploads/1/3/0/9/130969169/8130238.pdfIn PDF document text
    • https://golisarupu.weebly.com/uploads/1/3/5/3/135317681/talotetiletexavip.pdfIn PDF document text
    • http://mafonofolifeda.22web.org/52965123343.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466661/normal_5fcf671124d03.pdfIn PDF document text
    • https://lanasasaf.weebly.com/uploads/1/3/0/8/130815311/jabifolevu_fuzufafisofima.pdfIn PDF document text
    • https://devonejejarib.weebly.com/uploads/1/3/4/6/134608322/wutatipi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465394/normal_5ff919907fa09.pdfIn PDF document text
    • https://zimegusak.weebly.com/uploads/1/3/4/6/134605775/8014227.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384825/normal_5ff7120ad32ab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://napubuxuwel.epizy.com/43224666036.pdfIn PDF document text
    • http://maxafatuvapare.rf.gd/after_school_app_apk.pdfIn PDF document text
    • http://nenidexixod.epizy.com/yang_terdalam_tami_aulia.pdfIn PDF document text
    • http://luzutajezilako.rf.gd/nibesezubikesorab.pdfIn PDF document text
    • http://julefedego.rf.gd/information_security_mcq_questions_and_answers.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_off0000c1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1EE 5136 bytes
SHA-256: c40290773da573455c3e8ddeaa61d46858781d2a8e245844df983f3936d5212b
font_01_sfnt_off0000d37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37B 9836 bytes
SHA-256: 0288f147cb1c67c51f3ffbd35e800964aacd1ae8b814452664444c9bd96b2af0