Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd9399406e0095c…

MALICIOUS

PDF

80.8 KB Created: 2021-02-08 01:00:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7e87146f8798ac216f11add5efed350 SHA-1: fddf57c492129ee75a896a1db2d423c6682f5018 SHA-256: 5bd9399406e0095c6d39b54a33aef7b3ae64e64f592d43cb0c539e4c666eb168
156 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 other PDFs, suggesting a link farm or distribution mechanism for malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful sites.

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://baarspo.ru/123?utm_term=global+wind+patterns+worksheet+answer+key
    • https://static.s123-cdn-static.com/uploads/4384154/normal_5ff2119b7e017.pdf
    • https://cdn.sqhk.co/dopuwene/iaiajep/80367013749.pdf
    • https://gisijenoxumo.weebly.com/uploads/1/3/1/4/131437849/5db2db0b58329.pdf
    • https://static.s123-cdn-static.com/uploads/4390051/normal_5ff51f6a1cdd5.pdf
    • https://sojenumodab.weebly.com/uploads/1/3/5/2/135296615/xiresedosa_kakapes_nejexima.pdf
    • https://ganulexotugoris.weebly.com/uploads/1/3/1/1/131164012/xinekibu.pdf
    • https://cdn-cms.f-static.net/uploads/4382965/normal_5fdc40d0c9230.pdf
    • https://static.s123-cdn-static.com/uploads/4503617/normal_5fde318270e81.pdf
    • https://cdn.sqhk.co/zusisoko/e4khfgc/final_fantasy_3_map_world_of_ruin.pdf
    • https://cdn-cms.f-static.net/uploads/4503987/normal_5fd36b51e9881.pdf
    • https://cdn.sqhk.co/daborofus/GDFVVib/40905862188.pdf
    • https://static.s123-cdn-static.com/uploads/4468270/normal_5ff59a4284b89.pdf
    • https://static.s123-cdn-static.com/uploads/4409604/normal_5ff550b87d061.pdf
    • https://cdn-cms.f-static.net/uploads/4380082/normal_5fd83cbb09244.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/padosumifubobo/42392156718.pdf
    • https://s3.amazonaws.com/nedijowewoded/35295584504.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_off0000fcb9.bin
e704fa7550180bec60a292ee0b4c2d511895d48ffa9b53d447927f94781215c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB9 5476 bytes
font_01_sfnt_off00010f65.bin
3466927faea80a7b32b4bc6d562ef819a6f3d55b406bfde66ab697b7570eb3b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F65 11536 bytes