Malicious PDF — malware analysis report

Static analysis result for SHA-256 327f542147b463e5…

MALICIOUS

PDF

72.6 KB Created: 2020-12-22 15:56:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4a31291d3419e38f6f2e013026638f86 SHA-1: 1aeb152475a4b8186ff562c71351b02e75d7f312 SHA-256: 327f542147b463e5dac885f10521cd2736e5639421cd719bbdb0530f46ba6250
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to suspicious domains and one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO-based link farms designed to redirect users to harmful sites. No scripts were extracted, but the PDF structure itself is weaponized to deliver malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/strik?utm_term=midpoint+of+a+line+segment+definition+geometry In PDF document text
    • https://tejubodefi.weebly.com/uploads/1/3/4/3/134351051/5765574.pdfIn PDF document text
    • https://fabupegux.weebly.com/uploads/1/3/4/6/134689396/3547762.pdfIn PDF document text
    • https://weduzoviduluwiz.weebly.com/uploads/1/3/4/3/134385862/1875228.pdfIn PDF document text
    • https://tumixivig.weebly.com/uploads/1/3/1/6/131636813/4d6487.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/dujepav/online_movies_pro_paper_towns.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/apple_vpp_education_store.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe08c1173fb5383b69055f/1606289601900/bemesikemabobuzikegipojon.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/effects_of_colonialism_in_south_africa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e83c03d-b573-4214-8dae-befd7f0592dc/nothing_to_declare_movie_trailer.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/zhu_scalp_acupuncture.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc302ce16f6d44b07cc72db/t/5fcbe45f190ee82df8e999f4/1607197792382/juzinizobekir.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/esl_articles_grammar_worksheets.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC667 5468 bytes
SHA-256: d1ec68ed3ef00bcf022d13956ca21298cd91303117dff0528dce4672b7ad8dd2
font_01_sfnt_off0000d902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD902 11340 bytes
SHA-256: 76cc9835b5da81834f520e534be145d69520e9ab8b18b74a12bb1c8785728e3f
font_02_sfnt_off0001001a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001A 16164 bytes
SHA-256: d8d10563d97538cd660f1cf93789378c5b289d8511575134729739ef450c20fd

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