Malicious PDF — malware analysis report

Static analysis result for SHA-256 92dd886973a9ab37…

MALICIOUS

PDF

88.2 KB Created: 2020-12-18 12:10:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 4b4f13d1f3ee6910f3d3fdf739ec1d8c SHA-1: ea3ab91c910eac5110b20beae4b48406249fb894 SHA-256: 92dd886973a9ab37f0fc828b7ba95aaa5bbcf71458c210b62b3fa44b454eae74
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The ML classifier also flagged it with high confidence. While no scripts were extracted, the presence of a malicious URL and the 'SE_DOWNLOAD_BUTTON' heuristic suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?utm_term=format+ac3+mx+player In PDF document text
    • https://cdn-cms.f-static.net/uploads/4414487/normal_5f950bbd59f0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450141/normal_5fa49b1e109e0.pdfIn PDF document text
    • https://sapakokejepudig.weebly.com/uploads/1/3/4/4/134457578/diloxafavefexod.pdfIn PDF document text
    • https://majemuxisirilud.weebly.com/uploads/1/3/4/7/134719568/tozadabikigadelatu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366408/normal_5f94dfa6d38a6.pdfIn PDF document text
    • https://pipoxaxem.weebly.com/uploads/1/3/4/4/134498503/jarumovejefav.pdfIn PDF document text
    • https://lamekibig.weebly.com/uploads/1/3/4/6/134652122/nufujuvikexe.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/d6a666e1-0aea-422f-ace3-2d27592225c7/51638810097.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/eset_nod32_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/the_revised_fundamentals_of_caregiving.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce9e3721-fb9f-4384-aa21-a3c602e07023/40527964815.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D7 6568 bytes
SHA-256: a4af041a1f0d4c38f6ad1bf96ad04d86226b7158e00c36bfafa620d2932d04d4
font_01_sfnt_off0000e7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F4 3064 bytes
SHA-256: 0b5e2232e287906fa69f7cdc51ab19c8c92147b2e4fba8c5edcc65ed17d50ef2
font_02_sfnt_off0000f2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BF 5188 bytes
SHA-256: cc27b2b94f5840ecead1b650974d65431b3d1fd93820c813eabab0769628d92d
font_03_sfnt_off00010455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10455 4868 bytes
SHA-256: b227ef109151bac5ea5d081201fe7812d3d8b0397ed121d7ef1ed205763df645
font_04_sfnt_off00011646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11646 10924 bytes
SHA-256: 2f54f9ea1fe9ae9924ff80cc1ff662ea2b082c1d236ac499bb9d33e42c7545a6
font_05_sfnt_off00013bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB9 16568 bytes
SHA-256: cf404e83c41ca712cdb9c981ba3d4fb99c772a976842d376d2b50ee8232113d7

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