Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84a54f807db5522…

MALICIOUS

PDF

79.6 KB Created: 2021-03-18 07:33:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 43f99c1ddaf9ccbccb11853dc25627a8 SHA-1: dd2b909875cc6885a957990af8986dfd93db7914 SHA-256: f84a54f807db5522921f5880258334014b15b09114e889776cd31d23554b6d09
154 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing indicating it links to known malicious redirector infrastructure, specifically pointing to 'https://yafferge.ru/award?keyword=difference+between+language+acquisition+and+language+learning+pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to be a lure related to academic search terms, likely to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/award?keyword=difference+between+language+acquisition+and+language+learning+pdf In PDF document text
    • http://jobipelulimobo.iblogger.org/bumalegetugepalef.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/jjejjjX/91431570891.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/jfQie8I/piano_keyboard_layout_36_keys.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/744c7da3-b690-445a-afe9-55ef40ad7690/sense_and_sensibility_cast_1981.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed387db1-16f8-4370-92b9-147b367f445f/bulova_precisionist_x_limited_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/postman_extension_for_chrome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6b1eb03-37d3-40ef-80ea-755c5aac5ce5/14432382692.pdfIn PDF document text
    • http://nutonujisebife.epizy.com/52383939183.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/766c4bba-a29a-483f-b545-8d851358a119/9805882448.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86d7af7f-3dba-43e7-9d9f-fb65c83b229d/kubota_bx2200_oil_type.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71096e7f-3158-4ce7-a048-922f41912d4b/bobata.pdfIn PDF document text
    • http://getetir.epizy.com/xusupebutunitimiwojiku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0cafebd-ad00-45e1-8eae-e72fe2cb4f81/66538955228.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/rusajibarazewokevuwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b389dc82-7b92-4eff-a5ee-ac15048b34ee/how_did_the_nazis_rise_to_power_quizlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec58f162-7ac6-448d-afaf-d1cd90792fca/craftsman_table_saw_model_113_blade_guard.pdfIn PDF document text
    • http://rakikazava.rf.gd/how_to_take_screenshot_in_windows_7_using_keyboard.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/fogupupifaguwanisolopavut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/411322d4-ca4c-4754-893d-f0689162e886/30084053736.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/12277395076.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_off0000f6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FC 5680 bytes
SHA-256: 29d6bfef4aac9e43650ef9510718ab7c8d9334882894cce3ea6564a5d2af4f75
font_01_sfnt_off00010a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6A 11212 bytes
SHA-256: 315e184b68b39418e41006b6da4ccb4bf66f919a13542efcae57c533e91d59b4

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