Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b8a0372d5f31f3…

MALICIOUS

PDF

33.7 KB Created: 2020-04-11 08:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2026-05-08
MD5: 44ad59f403713f1aa687b28d9f85fa26 SHA-1: 4948d886464663cf3f995f717504c26198e39c7e SHA-256: b4b8a0372d5f31f36d8ff506c7af43a79ea33d4fe5b7017f981b69f2c938d694
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or SEO manipulation tactic. The primary URL found in the document body, http://gclub.lucky1st.com/uploads/1/3/1/4/131437656/131437656.html#cummins+insite+tutorial, is also part of this pattern. The file's purpose appears to be to distribute these links rather than deliver a direct payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://gclub.lucky1st.com/uploads/1/3/1/4/131437656/131437656.html#cummins+insite+tutorial PDF link annotation
    • http://shellydoggrooming.com/uploads/1/3/0/4/130489926/pawadapakijefenil.pdfIn PDF document text
    • http://missouriwhitewatercenter.com/uploads/1/3/1/4/131437530/bizatonav_jusiwakud_lalapapuz.pdfIn PDF document text
    • http://ahimsa.health/uploads/1/3/0/5/130542692/zeforiwogipap.pdfIn PDF document text
    • http://we2gethertravel.com/uploads/1/3/1/4/131438449/a736af4f5501a7.pdfIn PDF document text
    • http://homefromhomebandbwinchester.com/uploads/1/3/0/6/130604179/pimonew.pdfIn PDF document text
    • http://barnesdrafting.com/uploads/1/3/0/6/130640107/zuboxe.pdfIn PDF document text
    • http://thecrystallinecavern.com/uploads/1/3/0/4/130483583/xisew_vikeliwovewe.pdfIn PDF document text
    • http://marshallsharp.com/uploads/1/3/0/6/130639385/7fe8855bfdf.pdfIn PDF document text
    • http://falcon-cyc.com/uploads/1/3/1/3/131384015/9738690.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

Related samples 6

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

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5981 8824 bytes
SHA-256: bed19760005e7e06c0e4d022440aa4f3356912a3c06b40d1c04ef5e30d1154e2

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