Malicious PDF — malware analysis report

Static analysis result for SHA-256 b03ea6449ee2f4a3…

MALICIOUS

PDF

81.3 KB Created: 2021-02-16 18:12:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a63319c5c090996877cb828a2c9cbeed SHA-1: 3cb88b1198083e9980f6fc7153201f7b3442b4e9 SHA-256: b03ea6449ee2f4a3ff2e658eab37bf5b80232c2965cc4bb62aa15fb39e2d449b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs hosted on suspicious domains, indicative of a link farm or phishing operation. ClamAV detected this as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of embedded URLs and the overall structure strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/wix?keyword=personal+narrative+examples+high+school
    • https://cdn.sqhk.co/dutimapo/gQhjYT1/51992758919.pdf
    • https://xonedapu.weebly.com/uploads/1/3/4/6/134654428/xalivosabanaru.pdf
    • https://memezuwiz.weebly.com/uploads/1/3/4/7/134702577/xukoviwi.pdf
    • https://cdn.sqhk.co/wexazaruko/dwntijM/thrift_stores_open_near_me.pdf
    • https://cdn.sqhk.co/vupapevixu/NiejiLT/android_9_notification_sounds_location.pdf
    • https://mutebomex.weebly.com/uploads/1/3/2/7/132740724/vigelaz-koxefipoxemok-zodadogit-dadapapatafadi.pdf
    • https://cdn.sqhk.co/rubekafux/Bi2fXie/melokeni.pdf
    • http://tertov.xyz/vademecum_auriculoterapia_gratisdx9vm.pdf
    • https://xafituku.weebly.com/uploads/1/3/4/8/134863640/befaso.pdf
    • https://cdn-cms.f-static.net/uploads/4463807/normal_5fd8b9027910b.pdf
    • https://zopogunonezaso.weebly.com/uploads/1/3/1/6/131637395/bfdf39b9974ca5.pdf
    • https://cdn.sqhk.co/libibajuzumu/hgdghhg/2604763941.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xaviwawav.epizy.com/ignou_date_sheet_mca_2018.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_off00010178.bin
6d708356aee18da8c11a6b732abad166f1da1126d9fe9852949e467d39fceee3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10178 5476 bytes
font_01_sfnt_off000113fa.bin
5cb81865c788911fcf9dfd2eaf98782ed11b7a345bf1af97ec217cc5a7499192
pdf-font-stream PDF embedded font (sfnt) at offset 0x113FA 10624 bytes