Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff6970118afbcba3…

MALICIOUS

PDF

75.0 KB Created: 2021-02-07 13:15:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8355c834e81e0a3168d7ce7927fcaef3 SHA-1: b9216239ae1808ff8a96f947d764a99ad7d5a546 SHA-256: ff6970118afbcba3c3889753fe3b97b7842bceb736eacace01a150b29de38a42
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://maypoin.ru/aws?utm_term=medical+certificate+for+students+format PDF link annotation
    • https://cdn.sqhk.co/gobajejuz/RkhhAji/rivals_at_war_mod_apk_1._5._1.pdfIn PDF document text
    • https://wobelafesuta.weebly.com/uploads/1/3/4/7/134767333/65393.pdfIn PDF document text
    • https://cdn.sqhk.co/tamurikubol/augQdge/slow_mo_editor_free.pdfIn PDF document text
    • https://kezunegewekal.weebly.com/uploads/1/3/1/4/131483031/sukevomuzaviru_nafonawixedifab_melem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409998/normal_5ff96481c6e3d.pdfIn PDF document text
    • https://tifimiwarefimi.weebly.com/uploads/1/3/4/8/134895051/xolej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417426/normal_5fd1c91f0f615.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485321/normal_5feea8be62151.pdfIn PDF document text
    • https://cdn.sqhk.co/tinipuded/fgfBMgg/virtual_pet_sites_2019.pdfIn PDF document text
    • https://lufojujerap.weebly.com/uploads/1/3/4/4/134481619/sorurimagovuzub.pdfIn PDF document text
    • https://bukudemedu.weebly.com/uploads/1/3/1/4/131483547/ligoderil-zikuzan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412378/normal_60081d72d4766.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485813/normal_5fdc00d874123.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415309/normal_5ff09c81252fa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luxepiluwi.epizy.com/employee_assessment_template_excel.pdfIn PDF document text
    • http://fejivexol.epizy.com/wuvopegunaguwume.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_off0000e6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B7 5172 bytes
SHA-256: 9c6f4e84834be7e4c8ff766eea485a6e38b06b35f62b1aa014ddf97adb7de12a
font_01_sfnt_off0000f845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF845 10880 bytes
SHA-256: 99a8318bc6dbe61dc3f1a7ec4dd99165e52c2c457debc09df59813b3137e1af4

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