Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8356dc505c09f9…

MALICIOUS

PDF

69.1 KB Created: 2021-02-07 18:58:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 045b68c8c72ba26797130374c1c48bf1 SHA-1: 6e69a42afd57b1203e01ae6b3c6418acd2693884 SHA-256: 5d8356dc505c09f9af569d09965511226720810ec0896a3bc416e5c431cf24e2
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm, indicating a large number of external links, with one pointing to 'http://xsafak.com/zojarusotusadunimumy5706.pdf'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs and the nature of the link farm suggest an attempt to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/wb?keyword=answers%20to%20the%20impossible%20quiz%20demo PDF link annotation
    • http://xsafak.com/zojarusotusadunimumy5706.pdfIn PDF document text
    • https://zipatusuf.weebly.com/uploads/1/3/4/0/134012633/dulawofu.pdfIn PDF document text
    • https://bikigevoxepasi.weebly.com/uploads/1/3/4/7/134716722/4918990.pdfIn PDF document text
    • https://cdn.sqhk.co/retesixabe/Y8jhiid/baruzamozezug.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafori/fjcNW4h/wutenoxugamimexaxil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388282/normal_5fefc7d177703.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/ijzhbii/fogemaso.pdfIn PDF document text
    • https://buranujepexu.weebly.com/uploads/1/3/4/3/134339299/zumogogigosurovalik.pdfIn PDF document text
    • https://cdn.sqhk.co/jiwonukunav/yjbjjjc/goblin_shark_eating_fish_video.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xapota/36816619544.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/piwagenebudutitodag.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/ashokan_edicts.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_off0000d170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD170 5384 bytes
SHA-256: bb7b1e723f62d18e721e1c0b12868dc6f8518967e3c66546d385612f332dd8a5
font_01_sfnt_off0000e3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A1 10748 bytes
SHA-256: 8854e7c88a6b565c07c392533fba113b09155e03a57be9166d91e0f1c5b9f7cc

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