Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a0e8e5ccedb18b5…

MALICIOUS

PDF

77.3 KB Created: 2021-01-01 22:47:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ef5c3592c4052f0e923fa91439787e11 SHA-1: 2828bba8a9d30d814f817e4c9868aaa9dc60b687 SHA-256: 8a0e8e5ccedb18b52955adfa5222fd0b4e5f6f80d8e65b11521a1bc8e0c4b840
214 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, with at least one identified as a malicious redirector. The heuristic firings indicate it is part of a link farm designed to direct users to potentially harmful sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gettraff.ru/123?utm_term=saeco+intelia+deluxe+hd8771%252F93+manual In PDF document text
    • https://duvupobilalef.weebly.com/uploads/1/3/4/6/134630448/7884842.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402289/normal_5f929437e8e03.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/b3045da0-3dd7-45d7-ad6c-e8d573a10a78/13533259811.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b452a5b-01c1-4983-8355-553a8967fdfb/dell_latitude_e6530_drivers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74888afb-ae3a-4631-94c8-40b48fb1f00f/gebezajobunatepugutujex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdb01baf-631e-4bba-9af2-38dd7c24a2f7/the_official_sat_study_guide_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba217f0b-399e-4433-8a0f-9729b5417f45/61537528317.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26796863-5d39-4c58-933e-b28373962c85/kezivasijonerov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f056c421-bfc6-4e41-b6d5-2405d8c51cdd/61954491970.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/create_your_own_workout_plan_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/immunization_record_form.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_off0000e3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C9 5640 bytes
SHA-256: 26552494b9593f59054976c708f7259862e5e08a223d444444668cfcb4c3b946
font_01_sfnt_off0000f6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DB 11056 bytes
SHA-256: 501f8655512b523cf775e51a897e2c59cdf2ec3479057d2ccb34a5ed942ee129
font_02_sfnt_off00011a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A31 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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