Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc3d4a7e488d5da…

MALICIOUS

PDF

39.4 KB Created: 2020-06-17 05:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5a1fb43cbf1f629252e877b1d65091e SHA-1: 8fe1bc8444d1c9d0533d501f40d3d6399511d9f6 SHA-256: 8cc3d4a7e488d5daf46aebe93da2090ac28eb61dfdc51c91afc69c71d5e7b0eb
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files on various domains. This pattern is indicative of a link farm designed to lure users into downloading malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a 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://madelinerhodes.com/uploads/1/3/0/8/130814063/130814063.html#foxit+reader+convert+pdf+to+word+free
    • http://support.rmahf.org/uploads/1/3/0/7/130740050/4882942.pdf
    • http://designsbyjael.shop/uploads/1/3/0/7/130775434/bawimativog.pdf
    • http://bakedbounties.com/uploads/1/3/0/2/130289610/6012326.pdf
    • http://repulsebayhongkong.com/uploads/1/3/1/3/131384305/sekajabalarijuluwug.pdf
    • http://snbinteriors.co.uk/uploads/1/3/0/7/130776349/5018619.pdf
    • http://readysetbattlela.com/uploads/1/3/0/5/130588518/8382539.pdf
    • http://webdisk.zeldadoll.com/uploads/1/3/0/5/130544872/xubalidefudupaj.pdf
    • http://rockingmfsporthorses.com/uploads/1/3/1/3/131398252/zopazow_xigurevi.pdf
    • http://melerd.com/uploads/1/3/0/7/130739250/potogoxo_narukev_zuniwipaf_kujasate.pdf
    • http://slayhousemk.com/uploads/1/3/0/7/130739001/jixanedadadeso.pdf
    • http://4p7.undesirable.us/uploads/1/3/0/3/130312973/8840670.pdf
    • http://mta-sts.mx.repyourfaith.com/uploads/1/3/1/6/131606202/6348498.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a22.bin
38998d00e66e7f70b17159b3c244d46360fc84a523181005b9973520c5adfb16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A22 4900 bytes
font_01_sfnt_off00006aec.bin
15eb332ba4dd0b442598e315039050ddae6d209b6fcef1ebde8ed6924fd9b350		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AEC 11480 bytes

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