Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfde86f954458dee…

MALICIOUS

PDF

41.2 KB Created: 2020-03-31 09:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dbefb018877cf2b78006712cd8aa755b SHA-1: 0131907595e11a7c22cdd28901da2919c229d9c2 SHA-256: dfde86f954458dee44c7532c0993f8d893ec9fed5925cf9efb25797325ba50b1
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links to other PDF files hosted on various domains. This pattern is indicative of a link farm or SEO poisoning attack, designed to drive traffic or distribute malicious content. The ML classifier strongly supports the malicious verdict. No scripts were extracted, and the document body is largely unreadable binary data, but the presence of numerous external links is the primary indicator of malicious intent.

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://lennoxweb.com/uploads/1/3/0/6/130604395/130604395.html#ejercicios+de+matematicas+para+6+primaria+para+imprimir
    • http://georginariel2018.com/uploads/1/3/0/6/130604441/b731d.pdf
    • http://agreaterstorm.com/uploads/1/3/0/8/130814132/tusisogegapir.pdf
    • http://701sno.com/uploads/1/3/0/5/130540214/e42a73d9.pdf
    • http://jptowers.com/uploads/1/3/0/2/130287441/gofimuxa-tatoko-zajanixazamiki.pdf
    • http://dariospainting.com/uploads/1/3/0/2/130270897/2971259.pdf
    • http://livesobrightly.com/uploads/1/3/0/8/130813967/pudovoguzimaxuzedure.pdf
    • http://truthbeshonefilms.com/uploads/1/3/0/7/130738825/regarefixabi.pdf
    • http://crosleycorporation.com/uploads/1/3/0/6/130605048/zutulepivifowi.pdf
    • http://webdisk.unlimitedpotentialaz.org/uploads/1/3/0/5/130541733/1805e112.pdf
    • http://houseforsalellc.com/uploads/1/3/0/3/130313117/1575185.pdf
    • http://locksmithsouthphilly.com/uploads/1/3/0/5/130539479/migikegonaridas.pdf
    • http://local225bbq.com/uploads/1/3/0/7/130739479/96cf448695.pdf
    • http://me-solutions.org/uploads/1/3/0/5/130550912/65288804d2017.pdf
    • http://kenrictaylor.net/uploads/1/3/0/8/130815014/wasujaxuse_mamuxufuroki_vikafafegi_xagiruzipad.pdf
    • http://elainecasephotography.com/uploads/1/3/0/5/130590678/7f72adebeac84.pdf
    • http://legalpt.com/uploads/1/3/0/4/130435978/kazesub.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000761e.bin
0a595127976c345cd83ec1f8eb30bac405f6edbcf0e58cff1907341ffcf2dcad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x761E 8564 bytes

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