Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa04126bddadd6d7…

MALICIOUS

PDF

75.1 KB Created: 2021-05-18 12:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32efad441be86946d169e54fb1edf6ba SHA-1: 10c820c45bffeba02729fd0d0040051c533ce065 SHA-256: aa04126bddadd6d7ca73e89ebe69ebb92820cba59ac34667cff1c34499800be0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of a link farm designed to manipulate search engine results. The primary malicious URL identified is https://mezovuduw.ru/wb?keyword=romeo%20and%20juliet%20act%203%20scene%201%20question%20answers, which is presented as a search result to lure users. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/wb?keyword=romeo%20and%20juliet%20act%203%20scene%201%20question%20answers
    • https://static.s123-cdn-static.com/uploads/4409826/normal_5fdce17932c69.pdf
    • https://fizinizaboz.weebly.com/uploads/1/3/5/3/135304720/727ff.pdf
    • https://static.s123-cdn-static.com/uploads/4449187/normal_5ff49e347114a.pdf
    • https://cdn-cms.f-static.net/uploads/4406776/normal_60612040c92d8.pdf
    • https://gizafagubezuz.weebly.com/uploads/1/3/5/3/135321184/488099.pdf
    • https://static.s123-cdn-static.com/uploads/4489041/normal_5fde61f7d70fc.pdf
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/noguda.pdf
    • http://sobozunikira.22web.org/66898785030.pdf
    • https://nakubinigana.weebly.com/uploads/1/3/1/3/131379761/9046475.pdf
    • https://vizijupazikek.weebly.com/uploads/1/3/2/8/132814338/lopexifokezevup_vofezew_tosadugafuv.pdf
    • https://molisepav.weebly.com/uploads/1/3/5/3/135347716/d3eb5b.pdf
    • https://jogelobob.weebly.com/uploads/1/3/5/9/135961552/7687672.pdf
    • https://fiwobezamarevev.weebly.com/uploads/1/3/2/7/132740324/lurewuravoladibalosi.pdf
    • https://fidejilajusaxe.weebly.com/uploads/1/3/4/3/134363993/5749391.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/12d70409-a4fd-4e9b-9633-7f1f5dea16e8/is_going_gluten_free_good_for_you.pdf
    • https://uploads.strikinglycdn.com/files/4d769cec-138f-4d12-8a63-bebc605bcba7/57124127580.pdf
    • https://s3.amazonaws.com/xasovewipeje/do_you_need_a_license_to_do_eyelash_extensions_in_florida.pdf
    • https://s3.amazonaws.com/wajibile/laparabiwifutemipo.pdf
    • https://s3.amazonaws.com/sojenozap/rafobabijejes.pdf
    • http://mufizepumu.rf.gd/nonobidonuxikojugepirok.pdf
    • http://validexa.epizy.com/zunejeterepozaniwizirenem.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_off0000e7ea.bin
245351f7b37768049af8c41e20b755621ef4fbc1840f59fb8e18a36df5676c85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EA 5604 bytes
font_01_sfnt_off0000faf8.bin
96d3f272b36c355daa788330ce2a7016e666f7c0a8a806937b4d0fb1282b082b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF8 10936 bytes

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