Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f05f752f0ed10e…

MALICIOUS

PDF

105.3 KB Created: 2021-02-27 09:44:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 30329bb21c10c8181049b5fd6d4a024b SHA-1: 32931c02ef8144157f9ddb2e62726b955938c485 SHA-256: a0f05f752f0ed10e02f4ebe14a6052e0a1f786fb57f1e926610ee98dedf8d51b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One of the primary URLs, https://mezovuduw.ru/strik, is flagged as suspicious and likely serves as a distribution point for malicious content. The ClamAV detection and ML classifier further indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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/strik?utm_term=magic+tree+house+merlin+missions PDF link annotation
    • http://tafugegajotu.mygamesonline.org/how_to_yoga_breathing_exercises.pdfIn PDF document text
    • http://clientbluebadge.com/geloxibisatonimasigi6r8j.pdfIn PDF document text
    • http://parhelifrl.space/what_is_wrong_with_the_american_criminal_justice_systemb2uvf.pdfIn PDF document text
    • https://guzesunidami.weebly.com/uploads/1/3/0/8/130873942/7841328.pdfIn PDF document text
    • https://bewirawafatuli.weebly.com/uploads/1/3/4/5/134595338/7fac9.pdfIn PDF document text
    • http://shoes-storie.club/33220445106vfnbc.pdfIn PDF document text
    • http://bibopasaxuvibu.mypressonline.com/what_is_the_best_creme_frappuccino_at_starbucks.pdfIn PDF document text
    • http://vodabutopidaru.getenjoyment.net/bugaboo_frog_seat_cover.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/gelawiweza/91386545241.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/woxekufuvowomadupozogox.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/delhi_university_ba_exam_date_sheet_2019.pdfIn PDF document text
    • http://miwofalixi.rf.gd/formas_de_bardear_un_terreno.pdfIn PDF document text
    • http://wotidupodugi.myartsonline.com/mcsa_windows_server_2016_study_guide_exam_70-740_book.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/lufuguminijafiwi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CDE 5012 bytes
SHA-256: d533ceb9b2574f4c0931807b50fd1b4586062834e5c9e3eeef8da0deb96d22e1
font_01_sfnt_off00015e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E6B 5220 bytes
SHA-256: 0f6e01541fcbe30c7d3249e781f74abb2cb002fcb2f825aa20c436bb9754e6fa
font_02_sfnt_off0001700d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1700D 12108 bytes
SHA-256: 043994842d362757065501cc7ca3cdd249e178332687416743190f9d1c4ebba3

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