Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b58806c3671bacb…

MALICIOUS

PDF

66.5 KB Created: 2020-12-05 19:40:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: fc46cdd794cb0af2efa2460799d33572 SHA-1: d85cebe73b791d8a5485076e1ce61975158b4fd4 SHA-256: 3b58806c3671bacb3d01b416586e8902d90ed9249448832a0efb43d54885ff2f
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 0.9995

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://traffset.ru/strik?utm_term=instruments+in+the+redeemer%2527s+hands+chapter+summary PDF link annotation
    • https://kesevaze.weebly.com/uploads/1/3/1/3/131383297/3151fd0fd.pdfIn PDF document text
    • https://lozugukavokukes.weebly.com/uploads/1/3/4/3/134357100/2ce8e2833192.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473916/normal_5fca058f12b97.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/fizaxo/boruxunok.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/cardiovascular_disease_project.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/construction_and_working_of_biogas_plant.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/consonant_and_vowel_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/movies_at_sawgrass_sunrise.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5240da13a450bab0fe7b5/t/5fc9feccd7c3040d8735e99b/1607073485090/memodafiferewaxu.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/geektyper_app_for_android.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_off0000c9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A1 5356 bytes
SHA-256: d954a2b6797165aaa5bf4780db8509ff26417550be71b90678751519f7c02757
font_01_sfnt_off0000dbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB4 9908 bytes
SHA-256: b41e51b02bb78bd25c88e682a5bd6a5141fbf118ea5d1360bf9561b536553374