Malicious PDF — malware analysis report

Static analysis result for SHA-256 eea0c03f8ac4182b…

MALICIOUS

PDF

75.1 KB Created: 2021-04-25 19:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0735446335520a0cc6bcc58aa3eacd74 SHA-1: d3b5332e3af5ff2f8d421e63073921cdb401e760 SHA-256: eea0c03f8ac4182b2bacb1e991480817fd40461ea31c542abc575cfe5f78314a
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 to obscure domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious content designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=love+is+in+the+earth+the+crystal+%2526+mineral+encyclopedia
    • http://bitalotava.scienceontheweb.net/moromumozu.pdf
    • https://cdn.sqhk.co/kelanadu/fgc5qha/islamic_song_2019_mp3_download.pdf
    • http://zawugudumi.getenjoyment.net/sat_reasoning_test_preparation_books.pdf
    • https://foworagajiwodim.weebly.com/uploads/1/3/0/9/130969946/rewapaweg-buvilorewe.pdf
    • https://lefilima.weebly.com/uploads/1/3/0/7/130775934/9235313.pdf
    • https://cdn-cms.f-static.net/uploads/4370528/normal_60533229a9dcf.pdf
    • https://cdn.sqhk.co/maxanogefo/fgegdYF/77882918407.pdf
    • https://sepebukov.weebly.com/uploads/1/3/1/4/131408100/vulafijo.pdf
    • https://static.s123-cdn-static.com/uploads/4427097/normal_6001f09205bd9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/domegagowevag/77164331559.pdf
    • https://s3.amazonaws.com/jidosatikim/bioplastics_research_paper.pdf
    • http://tibutariwu.myartsonline.com/15083728704.pdf
    • http://wotidupodugi.myartsonline.com/carnatic_music_basic_lessons.pdf
    • https://s3.amazonaws.com/zafibimutadoti/petty_cash_forms_free_template.pdf
    • https://s3.amazonaws.com/nevowimo/wafuvanofiparel.pdf
    • https://s3.amazonaws.com/wetowuzuxit/51529638590.pdf
    • https://s3.amazonaws.com/sisaxu/gasagolulepomelike.pdf
    • https://s3.amazonaws.com/penefelomiju/free_math_worksheets_subtraction_with_regrouping.pdf
    • https://s3.amazonaws.com/pibabopuduj/answer_ogio_velocity_backpack.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_off0000e883.bin
205fa3ef4a257c07a32e2346f7f83dcf589f6c87eea017c6f837283931fc0147		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE883 4992 bytes
font_01_sfnt_off0000f98a.bin
6c8e46d48ed8008ca3683dbf999dfe14a44986ab68dce8df87067857f455fa38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF98A 10980 bytes

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