Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e16a125586a6513…

MALICIOUS

PDF

40.8 KB Created: 2020-05-14 06:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3926aa3e517d1dff63f11e1b63ae9c1a SHA-1: 15689a18e2c01169f4b25e352b0c4283dd1474fc SHA-256: 4e16a125586a65131abd49fa13619113fb10ec57e9b2f418f38f9b0abf692c2e
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links to other PDFs hosted on various domains, indicative of a link farm or SEO abuse. The ML classifier strongly flagged this PDF as malicious. The document body contains text related to 'cash flow statement excel free', suggesting a lure to attract users searching for financial templates. No scripts were extracted from this sample.

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://revolutionpoledance.com/uploads/1/3/0/5/130589401/130589401.html#cash+flow+statement+excel+free
    • http://lonersnomadsmc.ca/uploads/1/3/0/2/130272619/e2439abacc5193.pdf
    • http://foreverhereforyou.com/uploads/1/3/1/4/131482937/lipitixukag.pdf
    • http://zfoto.net/uploads/1/3/0/7/130738662/6705589.pdf
    • http://doublebloomcreations.com/uploads/1/3/1/4/131438471/rodubafix-wodawosewa-dukidof-doduwajazuroboj.pdf
    • http://buchanannutrition.com/uploads/1/3/0/6/130604725/pafiropetu.pdf
    • http://thelogout.net/uploads/1/3/0/6/130639236/xuzewixa_nuleko.pdf
    • http://rebirthmyboard.com/uploads/1/3/1/4/131483110/sogij.pdf
    • http://irinelshow.it/uploads/1/3/0/7/130740325/retipozuwajoj_xomobavazu.pdf
    • http://arjayjones.com/uploads/1/3/0/6/130604305/ab1d9cec6a.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_off00007367.bin
15032099b78cd63f35714b370371f04652439b676138e94ff2f455dc121bbfb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7367 10664 bytes

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