Malicious PDF — malware analysis report

Static analysis result for SHA-256 26239f6304ced2e5…

MALICIOUS

PDF

35.7 KB Created: 2020-03-24 23:21:49 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cea5762a70a99c8ea5401035e56656eb SHA-1: 413e92d827370d0a02667fdd14731af645910e38 SHA-256: 26239f6304ced2e5e96e87ab970ca1622148d4bc2e76b95a1c947fe5c657edc5
94 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, identified by the PDF_SEO_LINK_FARM heuristic, which strongly suggests a link farm or SEO spamming operation. The document body, though partially corrupted, contains a reference to a transcript and several of the extracted URLs also point to PDF files with similar naming conventions. The ML classifier also flagged this PDF as malicious with high confidence.

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://conleyfitness.net/uploads/1/3/0/5/130539165/130539165.html#serial+episode+9+transcript
    • http://crumbsycookie.com/uploads/1/3/0/5/130588962/wojizujaxemo-bujezelebijud-pafutubex-lamepasuveva.pdf
    • http://productionalgarve.com/uploads/1/3/0/6/130620437/ef6b16b4415a7de.pdf
    • http://laser4motion.co.nz/uploads/1/3/0/6/130604158/zowibegu.pdf
    • http://jodecoroadumc.org/uploads/1/3/0/6/130621498/175977.pdf
    • http://301barbershop.com/uploads/1/3/0/5/130588299/9277663.pdf
    • http://cpanel.modernjolie.com/uploads/1/3/0/7/130739326/8609544.pdf
    • http://virginiarecklessdrivinglawyer.net/uploads/1/3/0/3/130323409/xatosotejuxogukiset.pdf
    • http://webmail.freeshipcbd.com/uploads/1/3/0/6/130639603/sinizopukib_bidakugisosifa_wedudasopuwojis_tidegapidoze.pdf
    • http://www.al-jalal.com/uploads/1/3/0/7/130776167/tuwodewutapakudoro.pdf
    • http://quietrunlimited.com/uploads/1/3/0/6/130603747/gakewo-wetokesuneva-voborepixu.pdf
    • http://www.adlibbolton.com/uploads/1/3/0/6/130639147/3235185.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_off000063e7.bin
2f8a77cb86a69037452076bcad638389207549aeef81aea3619a24a4ee94d0cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63E7 7796 bytes

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