Malicious PDF — malware analysis report

Static analysis result for SHA-256 efbec3918cc5ec15…

MALICIOUS

PDF

72.6 KB Created: 2020-11-18 11:07:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: fdd69bc9269e1e43b10ef0d0cd27c902 SHA-1: 58bdd7e8fabdf942a51d155387275682a8b6280d SHA-256: efbec3918cc5ec1535666e8c60fac2e336a855b601062539b08e4bec0bd603bd
214 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of external links, many pointing to potentially malicious redirectors or link farms, suggesting an attempt to distribute malware or conduct phishing. The document body, though partially corrupted, contains text related to downloading a guide, which likely serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/strik?utm_term=a+beginner%2527s+guide+to+irrational+behavior+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413362/normal_5f95737ce661d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380079/normal_5f9180405cbc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375531/normal_5f92e91fa18a4.pdfIn PDF document text
    • https://wozofawado.weebly.com/uploads/1/3/0/8/130874325/5660968.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7de16b8b-0b2d-4a59-a295-afce5a6e0785/dofuwisosodutig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db5bd10f-a1af-48e9-8090-c91d2702b4e9/lodutudexulutovodurojopel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23fe3516-9962-4772-b03c-bf31b97a58a1/zugufateru.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/39562082255.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/celebrate_recovery_updated_leader_s_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a84e488-1955-4956-be05-33542f019628/sogidaga.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_off0000db1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1B 5400 bytes
SHA-256: ed6a3f8e25f173b98605a08c7d5b9ad5b43673504fa009e9236e61d9b94b2d5c
font_01_sfnt_off0000ed89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED89 11268 bytes
SHA-256: dbb6ffc5a33ba4ce0d96d2ad9e16fa247b1aaa4e6c729838ad3a8e6ec711a12c

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