Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2f6d8fa90368663…

MALICIOUS

PDF

63.0 KB Created: 2021-01-13 17:37:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 18246e323c741c510962dd780858723d SHA-1: ee597bb24c4bc1def80e2a68e7fdd89361d5eca4 SHA-256: e2f6d8fa903686632ea2e9d988165620728ea8b0d7faf641862376a117b11819
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file exhibits malicious characteristics, including a malformed stream and numerous embedded links pointing to known malicious redirectors and link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves luring users to external sites through a deceptive link farm, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://traffmen.ru/aws?utm_term=alkane+alkene+alkyne+worksheet+with+answers In PDF document text
    • https://site-1168300.mozfiles.com/files/1168300/promised_land_state_park_fishing_map.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451035/normal_5fdc6989b7c37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450898/normal_5fb8e5288955a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390350/normal_5f9cb595bff7a.pdfIn PDF document text
    • https://site-1179485.mozfiles.com/files/1179485/easy_chocolate_pudding_cake_recipe_from_scratch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402032/normal_5fb5d5c4d676c.pdfIn PDF document text
    • https://gunagabivap.weebly.com/uploads/1/3/4/8/134863042/c841127b.pdfIn PDF document text
    • https://togitarusufojir.weebly.com/uploads/1/3/2/6/132681229/6dd5746e6360c44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421934/normal_5f971a0a727f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489263/normal_5fab5a691b9d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454040/normal_5fd642958265f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000bac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC3 5020 bytes
SHA-256: 3b1e6d0fa46c1d7289ff6759fb8a7673caccd53b9c63f7fa0dc7aac0957aacbf
font_01_sfnt_off0000cbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE9 10360 bytes
SHA-256: eafc45b7f94f7031d8137901ba5aca71826397c7976c52f49d0b0e498b8ae570

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