Malicious PDF — malware analysis report

Static analysis result for SHA-256 a71d05c5f91746c8…

MALICIOUS

PDF

43.1 KB Created: 2020-10-08 07:40:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 39cb0d5b4520c424ce6c0bf2562993d5 SHA-1: 59f3c2c25bba308d4108b409d59a4dc4e2ae73de SHA-256: a71d05c5f91746c8bb0a79ba9fb9f04054da53aba390d2fa0b9f72dc695842aa
94 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a malicious redirector, linking to a URL associated with malicious activity. The document body, though heavily obfuscated, contains text related to Daikin air conditioners and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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://cctraff.ru/strik?keyword=daikin+air+conditioner+manual+troubleshooting In PDF document text
    • http://weboraf.igmlegal.com/uploads/1/3/0/7/130739892/zavowavirow.pdfIn PDF document text
    • http://files.narragansettgunclub.org/uploads/1/3/1/6/131606429/2136023.pdfIn PDF document text
    • https://site-1036811.mozfiles.com/files/1036811/lutigukiwigika.pdfIn PDF document text
    • https://site-1039772.mozfiles.com/files/1039772/pikos.pdfIn PDF document text
    • https://site-1038432.mozfiles.com/files/1038432/bajanid.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/e0173ea5-40ae-482b-ad64-c0b9991b124e/butagarumiruket.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21c74116-32fb-40f5-a930-87d76249eebc/besos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/302dee0d-53e4-4711-9d0e-3555c4235266/kuzokaxeweka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d433515-47d4-46bd-ab24-ecd38d776c58/mozobonomawenekamulirive.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_off00006c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C81 5556 bytes
SHA-256: 4e898d7cc41b0dc3e0987da930c58ca7879b1028c6a23ad0898ee3be08fd0c92
font_01_sfnt_off00007f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F40 9508 bytes
SHA-256: 58539bcaea7b515ff6bcd963356434c8ca7ae92d9c940689df9fe46fdba5bd23

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