Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f94583a618f5951…

MALICIOUS

PDF

119.1 KB Created: 2020-11-11 15:13:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 41a23bd1b1577ab8c63dce88a67e0c5b SHA-1: 1558df6be94205f72627d23f2de1850513d1a68d SHA-256: 9f94583a618f5951de255f8152ed93faa5664620152a6937a77a4025c87106ab
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/aws?utm_term=christian+black+codes+1724+pdf PDF link annotation
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/2933876.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424036/normal_5fa60d24498b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425491/normal_5f9dcaa2e16d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365649/normal_5f87487ca3732.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366369/normal_5f8c39e6c47fd.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/nademopor/bath_high_school_mi.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/17465174452.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/past_perfect_progressive_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/32829902424.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8fb6aae-5005-4905-a653-2c8f9fe73e05/actividades_para_desarrollo_personal_y_social.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/felabazibumikojekibe.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/79673217173.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_off0001942d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1942D 5704 bytes
SHA-256: f833dec881ada43bf6825a8f641b5d96e418f5bbfcc76ca05575e6e91a339169
font_01_sfnt_off0001a799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A799 12104 bytes
SHA-256: a5f20ac76fb4726ee05ac2d5d3ef15ab27abd5b210a6bcefa91ef9277e99ceba