Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4283111efcffb1…

MALICIOUS

PDF

69.0 KB Created: 2020-11-23 05:02:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: bb8bcef3a0def1c455c7dc0ed784dea0 SHA-1: 19a4882f357299fc158c4d1a0c39e8ecc8a7c38a SHA-256: 7a4283111efcffb1eb5ae8ce31aec08d43338f3ebf12b62f3fafdec65abf6235
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a link to a known malicious redirector infrastructure, suggesting it is used for phishing or malware distribution. The document body, though heavily obfuscated, appears to be related to a chemical equation, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 4

  • 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.
  • 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/123?utm_term=how+to+find+the+limiting+reactant+in+a+chemical+equation In PDF document text
    • https://cdn-cms.f-static.net/uploads/4414169/normal_5fae59a74babd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401518/normal_5f92edc0ced63.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/95e4a8bd-3a0d-4936-ac13-433dd7803c60/memibirifek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44f3149e-1ce8-45ed-95cd-9047ac48950c/laroka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9168137c-d2c7-42a3-8f4f-fb326084033a/88744033996.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bca9cb4-956b-4d92-bc03-ca2eae571bb0/goddess_of_yesterday.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7691dbf3-1cbe-4e09-b4ac-4e1c22a56e8e/standard_hotel_cafe_los_angeles.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/skulls_and_shackles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb7e0873-f998-42fb-ac21-d3ddbe705b36/jomajizefesegujugidag.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC300 5320 bytes
SHA-256: b914a3933e9e20c268e889a8f34da93829b99e73c0731a992cfc820c2338391c
font_01_sfnt_off0000d4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E8 10908 bytes
SHA-256: b8080588ed1ef6bc2752b0b41215a7153d75276ca5ffe8bef8196b80cded96a7
font_02_sfnt_off0000f8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EE 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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