Malicious PDF — malware analysis report

Static analysis result for SHA-256 34c06d57f7d484df…

MALICIOUS

PDF

99.7 KB Created: 2021-02-26 22:35:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bf6b8249619b90cea9c99e509307dcbd SHA-1: 817cc8e257f44628dfd9a82db9d45f93760d79c8 SHA-256: 34c06d57f7d484dfefff99ca63273645ab6bd50af500018de18e052ebce46848
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to external malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://pelibifir.ru/award?keyword=categorical+versus+numerical+data PDF link annotation
    • http://xuxetosufuzo.getenjoyment.net/sears_washer_and_dryer_combo_sale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408993/normal_6004b959ad704.pdfIn PDF document text
    • https://vukojudal.weebly.com/uploads/1/3/5/3/135317211/zujef.pdfIn PDF document text
    • https://kezikiwagoxarud.weebly.com/uploads/1/3/0/7/130739267/5f5ac539c904c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423471/normal_601ef30a67317.pdfIn PDF document text
    • https://cdn.sqhk.co/tusifefovozu/jihjZiU/jepikazudujezuwez.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/jjhwHaR/18389062082.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455208/normal_5feb93e8a9d01.pdfIn PDF document text
    • https://cdn.sqhk.co/rubutemoxe/hggijia/highway_rider_gameplay.pdfIn PDF document text
    • https://zofazozudu.weebly.com/uploads/1/3/0/7/130739697/nuwunemufadolikufo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492593/normal_5fdcb8f06c962.pdfIn PDF document text
    • https://cdn.sqhk.co/naxusepimosa/hiXkjgI/blazing_star_ranch_colorado.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/7000309589.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378836/normal_5fe930df9c2c0.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/tumuzu/22185824810.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/62510636803.pdfIn PDF document text
    • http://bodegifu.atwebpages.com/polycom_soundstation_2_non_expandable.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_off00013471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13471 5224 bytes
SHA-256: e93104f0c9ed51ce94753d27a6c2fd6d966d5c634090089bee7d080e835c4ec6
font_01_sfnt_off00014624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14624 10884 bytes
SHA-256: 989d261f8028e1ecfcd8103710ef99812492dde460d0d769e90289415a154ed7
font_02_sfnt_off00016b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B85 16376 bytes
SHA-256: 684a3c196e802b4dc45ee85e0d12f41c83d6b6c6a55a83cec5fb8e332ee9aa36

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