Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1b1fe53fe6aa9b…

MALICIOUS

PDF

71.6 KB Created: 2021-02-17 05:41:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 8592cdac11eabffe5e9c4b4796f12e85 SHA-1: 01bb76c273933b697ff652b64c35677b3e7b0b7e SHA-256: 5c1b1fe53fe6aa9b13e68ecf0042ef45363eda4fae24b8bb563e5f89a66f6dda
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, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URLs point towards a phishing or malicious content delivery mechanism, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wix?keyword=generation+2020+amos+rex PDF link annotation
    • https://bovejivisesuja.weebly.com/uploads/1/3/1/3/131384116/surog-fapisebal-jewaxanimigum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375708/normal_6029a6d2c8db6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450045/normal_6000065f8f8d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446770/normal_5fc575219f02e.pdfIn PDF document text
    • https://nolaxefipox.weebly.com/uploads/1/3/4/7/134740184/sunijib.pdfIn PDF document text
    • http://tetufava.iblogger.org/colibacillosis_pada_ayam.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/jofunozuzof/facebook_lite_letltse_apk.pdfIn PDF document text
    • http://dilezupuforew.epizy.com/guided_reading_levels_for_3rd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/neporezofov/caustic_3._2_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/teraxe.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/b._c._a_ka_full_form.pdfIn PDF document text
    • http://bumilamufitilu.epizy.com/sixth_grade_math_worksheets_word_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/jifasigadov.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/love_birthday_cake_free.pdfIn PDF document text
    • http://kiluxelatax.epizy.com/32416022641.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC8 5172 bytes
SHA-256: d40a9a6274206d837fa4743900350f2602eba46bca430d1e532b31a0fb2f4c5a
font_01_sfnt_off0000ef43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF43 9980 bytes
SHA-256: 7577e5cf4813d55f259d5ed41e078315a0698fd00778fa38108220ce2645058c

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