Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cc49233b1c49296…

MALICIOUS

PDF

65.4 KB Created: 2020-12-22 14:44:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 2bf500f74bb349bb155f7e911382bd21 SHA-1: 72e3e86d4cedb861d302ae38b3a2953dac4910a2 SHA-256: 5cc49233b1c492962476928021bf1254371964891db3559ed159e56a11e6bac2
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with at least two identified as pointing to malicious redirector infrastructure or a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://cctraff.ru/strik?utm_term=dreamette+menu+middleburg In PDF document text
    • https://static.s123-cdn-static.com/uploads/4490950/normal_5fc41418b03ff.pdfIn PDF document text
    • https://laxuruvu.weebly.com/uploads/1/3/1/4/131482832/6826984.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402960/normal_5fb32cccbb665.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384634/normal_5fcf643877e43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446260/normal_5fbe35314b9d0.pdfIn PDF document text
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/vujoji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385412/normal_5f924cad58cae.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/0290f29a-6108-4c2d-bb09-bcbcdca8ba4c/93883921847.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80835b55-bc2b-4af4-ac04-df4bf7c88d63/go_pro_by_eric_worre_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcffb9b8-6c4b-49a9-8bfe-1f594f28f3b1/soluxozamiguvibitivi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7f4ec4f-3e2d-4669-a8f4-d1618ed634d7/the_circuit_by_francisco_jimenez_full_book.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/unblocked_browser_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a900838c-1c50-447b-a613-553dfdaac15b/fanuc_irvision_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e647e24b-b52f-4c5d-8dec-fff66712afc9/29381399644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8dbab15-1207-46f6-b6dc-bcdbdecd8e22/mevonoron.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/73224534266.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_off0000c2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C1 5104 bytes
SHA-256: 6ad4bbe1c91adef7e4bfcd9202fe55279e426c8b605b6f50df66c9c7bba90cac
font_01_sfnt_off0000d407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD407 10844 bytes
SHA-256: 511acdd089ff615ca3e3f228d9ec8e3917198b1ae14acbaa64ddbbc938fbc1aa

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