Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c39d414e580a932…

MALICIOUS

PDF

67.6 KB Created: 2020-12-05 18:54:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 4db9b0db3ca2e34b1f70b13189a7db78 SHA-1: d3ee98e3df5ff77290041d00bdf4e2d498053564 SHA-256: 9c39d414e580a932e058d7ddc8993a40b1ea711c3b7e55c9fb2860adde877dd5
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 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/strik?utm_term=north+south+west+east PDF link annotation
    • https://gupufema.weebly.com/uploads/1/3/4/4/134456882/lizakusarujuta-tobar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412380/normal_5faf8e0f7c962.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368763/normal_5f87b33ff1f08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467043/normal_5fb2e57bbb4b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451932/normal_5f9f40d9a137c.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/ditiruz/best_letterhead_design_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/how_many_ml_in_one_shot_glass.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/29397361192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6319cb6-fc8c-4e23-a714-76f3f73f906a/mavoronubaxek.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/titubivavomoxididiv.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/bangla_comedy_natok_site.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4f3398139af03765f0b98/t/5fc61764a97599144ec981f9/1606817654554/idle_water_slide_mod_apk.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_off0000cdf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF0 4800 bytes
SHA-256: 94ca6f6c53a5a27241ab1317764693dd5c1e20165be4df0d8b17883135bda187
font_01_sfnt_off0000de50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE50 10584 bytes
SHA-256: bfec9d871f5e01548a560df624d2360af503c380b92178f439f51c6f1c256fe9