Malicious PDF — malware analysis report

Static analysis result for SHA-256 569c41ead5c7debc…

MALICIOUS

PDF

74.4 KB Created: 2021-06-12 15:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0ea7110819598e0f1daee4c4ab23a915 SHA-1: 590daf3c20a1b29d4ba9336fc5cd68309094f0c1 SHA-256: 569c41ead5c7debc64683a91a680951ff020f766af5c30194a3f62c278f309db
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URIs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://coretry.ru/pbw?utm_term=allah+hu+allah+hu+allah+allah+hu+allah+naat PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4480148/normal_60b514ce64333.pdfIn PDF document text
    • https://fuzakeraza.weebly.com/uploads/1/3/4/8/134848422/berawu.pdfIn PDF document text
    • https://lukobuguw.weebly.com/uploads/1/3/5/3/135396798/lanozijomoxir-gitanojutiduwek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454041/normal_602e2252a0908.pdfIn PDF document text
    • https://zoxofaduw.weebly.com/uploads/1/3/2/6/132683138/jakevifowiroge-febumomos-womivudezo-dufaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369640/normal_60008d9eec91d.pdfIn PDF document text
    • https://pipenuxoj.weebly.com/uploads/1/3/1/4/131406698/mivozimininokewito.pdfIn PDF document text
    • https://rulotukipaka.weebly.com/uploads/1/3/0/7/130776525/mekopabozudugi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457305/normal_60356ddbe70c7.pdfIn PDF document text
    • https://xukaxibuban.weebly.com/uploads/1/3/4/7/134701669/9a54b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390329/normal_60bcde6bd33b1.pdfIn PDF document text
    • https://kapupidaxor.weebly.com/uploads/1/3/5/3/135386814/2276523.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409244/normal_600ff16646d66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490264/normal_602afc1153fbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404500/normal_602bdd90029ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426954/normal_606e66b79fe11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487419/normal_604d25181da29.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nuxawakaxaz.pbworks.com/f/kuraw.pdfIn PDF document text
    • http://dumunivuniv.pbworks.com/w/file/fetch/144866175/30427392564.pdfIn PDF document text
    • http://katafuzum.pbworks.com/f/lipuwavuwuv.pdfIn PDF document text
    • http://wezenibafasi.pbworks.com/f/16583189254.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD018 4488 bytes
SHA-256: dff5aacebff28312208af2854a1c6de503b1c15ef5de3700a4fce2ac92f2e29c
font_01_sfnt_off0000df58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF58 11588 bytes
SHA-256: cccd3eaccbf9244e33035ce23a96047259d7973f4258a2f70448f9eac6278106
font_02_sfnt_off00010605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10605 16316 bytes
SHA-256: f57a7faf4060a56bfaccefff1a65583afc632df859e86cf52a0ed62fccb43d09