Malicious PDF — malware analysis report

Static analysis result for SHA-256 c90d89da0336dd9c…

MALICIOUS

PDF

74.0 KB Created: 2021-04-03 14:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0a390236bf0aaf79698d2e81b5b1cbf SHA-1: 78a789903eb354bd326fa43a434bd4ae7a1510c2 SHA-256: c90d89da0336dd9cd986f290c731da371cc75b68576ded97b440b0d76f4ffa72
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO poisoning and phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL `https://seumenha.ru/wix?keyword=zoos+myth+and+reality+answers` is likely a landing page for a phishing attack or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://seumenha.ru/wix?keyword=zoos+myth+and+reality+answers
    • https://cdn-cms.f-static.net/uploads/4374853/normal_60387c70157bf.pdf
    • https://ruregogawumol.weebly.com/uploads/1/3/2/8/132815787/lifupiwitazox.pdf
    • https://cdn-cms.f-static.net/uploads/4455881/normal_6059cf36c5adb.pdf
    • https://static.s123-cdn-static.com/uploads/4473041/normal_5ff3847c4625e.pdf
    • https://static.s123-cdn-static.com/uploads/4443574/normal_600600ceb8d2f.pdf
    • https://cdn-cms.f-static.net/uploads/4444386/normal_60371d812dafc.pdf
    • https://cdn-cms.f-static.net/uploads/4459785/normal_5fe992ba6f82d.pdf
    • https://cdn-cms.f-static.net/uploads/4408866/normal_6048716e4704c.pdf
    • https://cdn-cms.f-static.net/uploads/4454438/normal_600d87b4a3c13.pdf
    • https://static.s123-cdn-static.com/uploads/4489429/normal_5feb6fe471508.pdf
    • https://bapoxaluw.weebly.com/uploads/1/3/4/7/134717037/delepagunulawol.pdf
    • https://cdn-cms.f-static.net/uploads/4408485/normal_5fd7853a1df17.pdf
    • https://static.s123-cdn-static.com/uploads/4375194/normal_5ffb30e3a291f.pdf
    • https://static.s123-cdn-static.com/uploads/4391308/normal_5ff512327dac8.pdf
    • https://static.s123-cdn-static.com/uploads/4409610/normal_5fdfbbeea42e3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5757213d-bf13-4af9-8e41-cbdab252a4e4/63211409529.pdf
    • https://s3.amazonaws.com/tudawufed/15610822836.pdf
    • https://s3.amazonaws.com/wetevali/36372670198.pdf
    • https://s3.amazonaws.com/zamemigojat/rubik_s_cube_instructions_guide.pdf
    • https://s3.amazonaws.com/miwolezedubujoz/continuous_random_variable_example_questions_and_answers.pdf
    • https://uploads.strikinglycdn.com/files/2c155a9a-e0c0-4f9f-ab43-a419051b621b/shell_script_if_statement_multiple_conditions.pdf
    • https://uploads.strikinglycdn.com/files/b2b33d56-b9bf-4e0d-be9b-8136b8089862/different_tone_of_poems.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4c9.bin
c139b6f54318fe86504b2f6d0bd087ed52190e4d8873d40f9a99c022d1d75c06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C9 5216 bytes
font_01_sfnt_off0000f66e.bin
d8c7f7e42e3221d4fa1fb4e7f89ef09ba5bf24b84f1eee4b0677901e35f06204		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF66E 10572 bytes

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