Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad7cb6b92cd54862…

MALICIOUS

PDF

41.1 KB Created: 2020-04-07 14:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2026-05-09
MD5: d16e08da8b19767310ba62b6733f2cf2 SHA-1: cae314552d013f77ca1cc6d017559534e634da4b SHA-256: ad7cb6b92cd54862fd8fbb06ce52630558fde1b6906bf1e84df684e98c5c1947
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to domains that appear to be part of a link farm designed to host malicious content. The document body, though partially garbled, suggests a lure related to educational exercises. The ML classifier strongly indicated maliciousness, and the PDF structure itself was flagged for containing a mass of external links. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://everestdobie.com/uploads/1/3/0/6/130639971/130639971.html#ejercicios+de+suma+y+resta+para+ni%C3%B1os+de+3er+grado PDF link annotation
    • http://familylawmn.com/uploads/1/3/0/6/130621645/jebotupajova.pdfIn PDF document text
    • http://thatdesigndiva.com/uploads/1/3/0/5/130588997/zidexaduw.pdfIn PDF document text
    • http://eclipsestaffingsolutions.com/uploads/1/3/0/6/130621754/wiwekumowolapuw.pdfIn PDF document text
    • http://entrepreneursover50.com/uploads/1/3/0/6/130603850/lexuti_wujedafupo_mafowij_toboxisanurusev.pdfIn PDF document text
    • http://ddhp.org/uploads/1/3/0/4/130483617/xefaj.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 6

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_off00005f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F17 9056 bytes
SHA-256: f1890efccf44a92c0fb1178a233d00c91247a3eb308ba8f14a2626a0bcd5dc2d
font_01_sfnt_off00007fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FEC 16088 bytes
SHA-256: 287b852d1c1b0334c7d2ab49fe8ac8ac5488f6edefc3e00d5eee83c7048b9cc5

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