Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d6878435e38fe2…

MALICIOUS

PDF

63.2 KB Created: 2020-09-30 07:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a7b1fdb3cf533bf60415508df61a1d97 SHA-1: 6bcb8dc61cf83145632ee0315e60824f4b28283e SHA-256: 81d6878435e38fe250f5491591259d3e958c5af74c061e1453aad3fb109958f0
94 Risk Score

Malware Insights

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

The PDF contains an embedded link that redirects to a known malicious domain, indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The embedded URL is likely intended to trick the user into visiting a site that may host further malicious content or phishing attempts.

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://ggtraff.ru/strik?keyword=sindrome+de+apnea+obstructiva+del+sue%25C3%25B1o+pdf+2018 In PDF document text
    • http://fadunopu.hongnorr.com/uploads/1/3/1/4/131437252/b15e54575b32b.pdfIn PDF document text
    • http://jasogivuz.worthingexcelsior.co.uk/uploads/1/3/0/7/130776326/gokaxubutitisepusuli.pdfIn PDF document text
    • http://xasexoro.drtrevorsmith.com/uploads/1/3/1/8/131856369/misasuwisezoxag_jomob_bedifomex_mowudazapumit.pdfIn PDF document text
    • http://lolipo.ruleconsulting.org/uploads/1/3/1/3/131384380/5ba1f4e9fd.pdfIn PDF document text
    • http://noxuzuxor.migtires.com/uploads/1/3/1/8/131857054/fexojetusate-zinafesexozupok.pdfIn PDF document text
    • http://mixiwu.badbudcbd.com/uploads/1/3/2/6/132681910/8430776.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/eb9279a1-84be-4768-93dd-dba35c88b697/11024298074.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74846577-0819-4b8d-8ffd-5ab17776f679/baninunagemasopenefixar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03897a10-1798-4e35-813d-fc583de99e77/4027861368.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/027131da-74c9-4722-9ad7-3e75f9619371/zizojo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc293d08-c9b8-407d-a12a-8e1441628074/bezeragomamixan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f0d7462-34cf-4ecd-be91-8e7f5100d37d/64362381437.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/633087ab-4645-4bd2-84ff-5adbc8205ce0/4326374202.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_off0000a6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6C7 6216 bytes
SHA-256: c0eaee06a01ff76c15685c1b04dcb7e2c94b96b9e8e4d39ac2ce73713f53fde4
font_01_sfnt_off0000bb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB87 10804 bytes
SHA-256: b106f40d6ff000b8d118040afbe8eea57582d5722f6ab26fd9c8668f89d8d090
font_02_sfnt_off0000dee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE3 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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