Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f548881b3fee863…

MALICIOUS

PDF

77.9 KB Created: 2021-06-01 20:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4ac3dfea701ae96fc5442d53156b465 SHA-1: dc4f58e5073fc44bd2660843f2d215bf95575acd SHA-256: 5f548881b3fee8630796c62c7e912f4efe26a9dcc648eb447b64649904654fd5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting a link farm or redirection to malicious sites. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest potential exploitation or redirection to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crysiq.ru/pbw?utm_term=phonological+awareness+profile+pdf
    • https://static.s123-cdn-static.com/uploads/4484993/normal_5fd08867cd030.pdf
    • https://cdn-cms.f-static.net/uploads/4374522/normal_606b31e955588.pdf
    • https://cdn-cms.f-static.net/uploads/4424630/normal_600eb1a6386c1.pdf
    • https://xonalofogikovor.weebly.com/uploads/1/3/4/3/134372302/868aa1bcfef565.pdf
    • https://cdn-cms.f-static.net/uploads/4485296/normal_602631a392ff3.pdf
    • https://vetexugosopaviz.weebly.com/uploads/1/3/0/7/130738505/604ee382.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5ba22e4b-c765-42c8-8c78-98e354795a7f/ensino_fundamental_1_e_2_idade.pdf
    • https://uploads.strikinglycdn.com/files/9a9ab9d8-ed9b-4bbc-b381-20fa532f92fa/bubekulededizapuz.pdf
    • http://tusawijer.pbworks.com/f/jajonafuso.pdf
    • http://xedidovetaw.pbworks.com/f/83361014122.pdf
    • https://uploads.strikinglycdn.com/files/1a36e3e3-5ab1-4511-ae7d-3ac265319e59/zobefokupeniremukunu.pdf
    • https://uploads.strikinglycdn.com/files/2cf5efed-5d46-4393-af52-20e5d163305a/17540031099.pdf
    • http://xojifot.pbworks.com/f/sisematiravalewu.pdf
    • https://uploads.strikinglycdn.com/files/743ff0a5-0a0a-4ae9-9922-37a06c3f7f38/rotilekokiroxafizixazo.pdf
    • http://xuruzinijub.pbworks.com/w/file/fetch/144425520/what_is_a_strapline_in_a_magazine.pdf
    • http://funuvutidip.pbworks.com/f/lodunelevafuranuvijuf.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f40e.bin
6f016c9c37fec6eb022ea172f819d292184a0f220a317dd8db4ef24a17c884a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF40E 5508 bytes
font_01_sfnt_off000106db.bin
167b4eafb3614140c3421bb1679d9e04451bc077a17e74a1ea60b000e101650c
pdf-font-stream PDF embedded font (sfnt) at offset 0x106DB 10576 bytes