Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c01b67c1c27da9…

MALICIOUS

PDF

37.0 KB Created: 2020-05-25 21:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: cd01a1b8147aa32d1bfc9bd843eacc55 SHA-1: fbf785569de662a9be7b7799230076db5182f3c2 SHA-256: a9c01b67c1c27da907850ababe91d99b93728638c35d0c7f6e53baf96237e5d5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on different domains. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains references to the URLs, suggesting a deliberate attempt to create a link farm. The primary purpose appears to be SEO manipulation or potentially distributing further malicious content through the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 http://peakathleticsystems.com/uploads/1/3/0/6/130604196/130604196.html#gerald+and+piggie+coloring+pages PDF link annotation
    • http://1stchoicecontractingllc.com/uploads/1/3/1/6/131608016/roxuzugep.pdfIn PDF document text
    • http://jennytung.com/uploads/1/3/0/4/130490808/buvit.pdfIn PDF document text
    • http://andreasalgava.com/uploads/1/3/0/8/130873860/9365503.pdfIn PDF document text
    • http://hinesvilletoys.com/uploads/1/3/1/6/131607062/464923a3e16ef.pdfIn PDF document text
    • http://tlchconstructioninc.net/uploads/1/3/0/8/130814285/pepemupowunibawema.pdfIn PDF document text
    • http://aletaslater.com/uploads/1/3/0/5/130588718/5993d68e3.pdfIn PDF document text
    • http://theessentialeshelman.com/uploads/1/3/1/4/131410597/jozozedonedomixasi.pdfIn PDF document text
    • http://hremschol.com/uploads/1/3/0/4/130476481/1007304.pdfIn PDF document text
    • http://examplesites.biz/uploads/1/3/0/3/130323097/tuxamuxugozebumawupi.pdfIn PDF document text
    • http://sugarfischyteam.com/uploads/1/3/0/7/130738912/sajij.pdfIn PDF document text
    • http://maracramerlpc.com/uploads/1/3/0/6/130621019/xakip.pdfIn PDF document text
    • http://empoweruvr.com/uploads/1/3/0/6/130621196/livadidobobamixi.pdfIn PDF document text
    • http://tarabayliss.com/uploads/1/3/0/2/130289662/ba81a28f1944982.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50AA 10480 bytes
SHA-256: 9eaebef38a3921d1b161944e4274f80f26be94d0d9ec9f85bf3206c826728827
font_01_sfnt_off00007348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7348 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449

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