Malicious PDF — malware analysis report

Static analysis result for SHA-256 22ae9b3cc4f1ef04…

MALICIOUS

PDF

68.8 KB Created: 2020-12-20 19:45:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 05aff57f7cf00afaaa5928a1c652f006 SHA-1: b8416579d933393255973df503e348ffaf8787d1 SHA-256: 22ae9b3cc4f1ef04be7efb459e838d0859ca2c29999db3cfce04f3cf71cb3469
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. Another critical heuristic indicates a large number of external PDF links, suggesting a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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=new+international+division+of+labor+advantages+and+disadvantages In PDF document text
    • https://cdn-cms.f-static.net/uploads/4476446/normal_5fdb14b4a6490.pdfIn PDF document text
    • https://bulugigedi.weebly.com/uploads/1/3/4/7/134714886/4123706.pdfIn PDF document text
    • https://demifezi.weebly.com/uploads/1/3/1/3/131379940/1691024.pdfIn PDF document text
    • https://mutabitobivu.weebly.com/uploads/1/3/4/6/134636436/b42362f4e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wilugugo/widifopukiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03e0869d-3c6b-4106-b0d6-bfc82130745a/ikea_minde_mirror_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0af07bc-2b49-4c84-91f3-eb50280bbbdb/image_occlusion_anki_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0152c9b8-d12c-4c97-ae0f-6e47d80cec20/bemudavowavebas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bf7770e-1bbc-430d-a1d3-2274da9693fa/peloregorobejupaje.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5662fea4a794d56634e63/t/5fd660797fc52c206924066c/1607884922006/28729154553.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dc0731d-cf53-4557-8de5-fe9c12d40b1e/48410321902.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/043fca9f-636d-4b51-a310-af75fa3ecd5e/tasebof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/254ccbf5-c673-413e-be2f-cb229f505304/61011428748.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_off0000d0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B4 5336 bytes
SHA-256: dccf301be3a84a0fb7b19d1faae55459d57be93327c5f86f438b9eb30bb0b19c
font_01_sfnt_off0000e305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE305 10200 bytes
SHA-256: d63e0d8bbe5f8c41ae315af7661b962beb1e849436e64bc9a5371a08d4809831

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